I’ve got the 0.63 reducer and use it with both my Celestron 9.25” and my 5”. It’s must with SCTs for deep sky photography.
@AstroForumSpace
3 жыл бұрын
Thanks Fernando, clear skies!
@alfredobeltran611
3 жыл бұрын
Respectfully, I thing there’s something that needs to be clarified. The amount of light a telescope gathers depends on the aperture diameter, not on the f-ratio. F-ratio determines how much of that light is focused on a given part of the field of view. That’s why when the f-ratio is faster you have a brighter image. While imaging, if you’re above read noise of the camera (added to the thermal noise), faint details of the object will begin to show, no matter the f-ratio. Certainly will take longer if optics are slower and that’s the benefit of faster systems. I use a C9.25 EdgeHD with hyperstar at f2.3 and sometimes at f10. So, at f2.3 faint details come faster.
@AstroForumSpace
3 жыл бұрын
Yes, good point. Aperture determines how much light the scope is able to gather. I'll pin your post to clarify this, thanks. Clear skies.
@catchingphotons
3 жыл бұрын
@ Alfredo: Good point. May I ask something? You say: The amount of light collected by the telescope is determined by the aperture. - Looking at point-like sources and/or areal light in front of the scope (parallel light) the statement is obviously true. Same aperture - same light - no matter how long the "tube" is. - But looking at a real patch of night sky: I guess you will find more photons (absolute) per time in a wide patch of sky than in a narrow patch (FOV). So if you spread both onto a given&fixed sensor the scope with a long focal length will produce an image with a brighter areal luminosity than the scope with the shorter focal length -- given a fixed sensor, aperture and exposure time. Or am I mistaken? - So to my curiosity: Stars should stay equally bright (point sources) when prolonging the focal length while fixing everything else - whereas the areal luminosity should drop?! Thanks for clarification! -Chris
@alfredobeltran611
3 жыл бұрын
@@catchingphotons : Hi Chris The amount of light captured depends only on the telescope aperture (think of an analogy in which a bucket gathers rain drops). This light will come from the region of the sky, or FOV, where it’s pointing at. At the same aperture with short focal length, and thus faster f-ratio, more of that light will be focused on the same pixel, increasing the signal to noise ratio - SNR per pixel. If focal length is longer, then that same amount of light will be spread over more pixels. This results in that with the same aperture, and same time exposure, a faster f-ratio will produce a higher SNR image per pixel. Let’s assume we’re imaging a wide nebula. In a wider FOV we will gather more light from it, but what matters for capturing faint detail is to have more SNR per pixel. I’ll leave a link to my gallery where you can see images I’ve taken both at f10 and f2.3 with the same telescope (C9.25 EdgeHD). See for example the faint halo of M51 captured at f10. It is possible because the signal was above the total noise produced by the camera. Instagram: instagram.com/p/CAoJlqUpy1m/?igshid=hrmdx14gtbqb Full resolution here at Flickr: flic.kr/p/2j5EZqu About stars will happen the same and, being point light sources, at faster f-ratio would potentially saturate pixels faster that at a lower f-ratio, precisely because at faster f-ratio will direct more of that light to a single pixel.
@catchingphotons
3 жыл бұрын
@@alfredobeltran611 Ok thanks!! Quote: "At the same aperture with short focal length, and thus faster f-ratio, more of that light will be focused on the same pixel" But my argument was: If you collect light over the time d_t from a larger patch of sky you are able to collect more photons than from a smaller patch of sky over the same time d_t. Just because (physically) there are fewer photons coming from that patch of sky (because there is less universe behind that patch). >> So if you spread this total amount of photons on the same sensor the areal luminosity (photons per area sensor per time) does actually decrease with increased focal length. The SNR is "just" a side effect of the quantity of photons hitting the sensor/area/time :-) See my video about the science behind stacking and please (!) leave your comments under the video!! kzitem.info/news/bejne/o4Jpl3aDoGqXf5w Clear skies (and high SNR) to all of you! -Chris
@alfredobeltran611
3 жыл бұрын
Chris Of course the bigger the area of the FOV, the more photons of that area you'll get. But to capture faint details we need to look at the SNR per pixel. By the way, subscribed already to your channel!
@Osti67
3 жыл бұрын
Got the 8" SCT from celestron and the .7 reducer.... With the asi294 pro, you get sharper images with the reducer due to better tracking and sampling. Often after drizzle, the images are better then using the native 2032 focal length.... BTW I am also using an OAG, reduces weight and helps to guide much more accurate at 2000mm focal length....
@chaddennis9289
3 жыл бұрын
Great video! I appreciate you taking the time to share your experience. I use a field flattener on my smaller scopes but a reducer on skywatcher 100ed. It reduces the focal length and fstop but also helps with those smeared edges. Again, thanks for the vid from Tacoma, Washington USA
@AstroForumSpace
3 жыл бұрын
Thanks Chad, also for the tip on using a reducer with a refractor. Clear skies!
@dustyhammer7569
Жыл бұрын
I’m curious. So it zooms out objects, but halves the exposure time needed to gather light for an image. Let’s say that the object in focus is the distant *”Black Eye Galaxy M64”* Will the final product of it be smaller due to the Reducer?
@AstroForumSpace
Жыл бұрын
Yes, use astronomy.tools to calculate your exact fov.
@jeffreyvictor3678
3 жыл бұрын
You changed your wallpaper!
@AstroForumSpace
3 жыл бұрын
My wife did, lol.😉🌌
@shadowhenge7118
3 жыл бұрын
Problem im running into is im trying to switch from manual using my failing dslr and a lens, to a geq telescope with a zwo camera and have no idea all the pieces and parts i need, and how to set it up out of the box. Seems like noone sets up a kit from scratch and just does part reviews.
@AstroForumSpace
3 жыл бұрын
Hi there, yes, astrophotography can be quite overwhelming and it's difficult to capture everything in one movie. On my website, I have multiple blogs like this one: astroforumspace.com/seven-essential-steps-to-start-astrophotography/ where I attempt to give an overview of the things you need to think about and gear reviews. Hope this helps, don't hesitate to ask questions. Clear skies!
@bababoey3315
3 жыл бұрын
I think the 6.3 work with C8 edge hd
@AstroForumSpace
3 жыл бұрын
The .7 is especially designed for edge hd telescopes. .63 reducers usually with with regular Schmidt-Cassegrain telescopes. Clear skies!
@bababoey3315
3 жыл бұрын
I just bought a C8 edge hd beacause the normal have coma but coma reducer cost the edge hd soooooo….
@christoph4977
3 жыл бұрын
Reason 1. check, very good explanation. Reason 2. check also nice explanation. Reason 3. this myth again :D ... I know you disagree but food for thought here: if that f/ration myth were true ... why do you think all of the highest end professional instruments meant to capture deep-sky objects are f/30 with humongous apertures? Maybe because ONLY aperture lets you gather more light and you cannot achieve this by just reducing your focal length? I would be too happy to talk to you about this because I think such a great astrophotography communicator as yourself shouldn't be propagating this misconception. We can talk on Cloudynights
@bruce12000
2 жыл бұрын
Hi Christopher we are in 2021 imaging and observation are two different things Celestron make also an raza at f/2 to gather en en more light faster this kind of telescope is designed specially to gâter more light to cut down imaging time exactly like he explains
@malanstecker
2 жыл бұрын
Have you noted any red & blue color fringing from your EdgeHD with the Celestron 0.7 focal reducer when photographing the moon? I have as shown at: mstecker.com/pages/CelestronEdgeHD925-tests.htm Not sure what causes it, but Cloudy Nights reported it as a problem with the Celestron 0.7x EdgeHD focal reducer. www.cloudynights.com/topic/758116-whats-wrong-edgehd-925-with-7-focal-reducer/
@AstroForumSpace
2 жыл бұрын
Hi Michael, I'm always imaging the moon in monochrome, so I wouldn't know. And for deep-sky I also use a cooled monochrome camera with lrgb and narrowband filters.
@seanburst564
11 күн бұрын
I accidentally got the 0.63x reducer before I realized the issue. Kind of annoying, but cropping the image isn't the worst issue to have for the wider FOV.
@AstroForumSpace
10 күн бұрын
Everybody crops anyway as we are dithering the images
@brendanmanning1959
Жыл бұрын
Edge HD 9, 25 focal lengths 2350
@toddao818
2 жыл бұрын
Very informative and helpful. Thank you. I have an EdgeHD 8 and look forward to getting the .7 reducer as the next upgrade. Pointer - when threading on filters, adapters, etc. try doing a left-loosy (CCW) rotation first to seat the threads, then righty-tighty (CW) to screw it on. If anyone is watching me do this, 9 times out of 10, they will say "the other direction," like I don't know what I'm doing. But I know that I am ensuring the threads are properly seated and consequently the parts are less likely to fuse from having mashed threads.
@AstroForumSpace
2 жыл бұрын
Sounds like good advice. Cheers.
@astrozeugs
3 жыл бұрын
In theory the image quality improves too. The reason is you will crop less in the optics light circle provided by the telescope. In most cases the quality stays the same because of the glas quality of the reducer. I use a RC6" with an 0.67 Reducer. Thanks for sharing this. Regards Andreas
@AstroForumSpace
3 жыл бұрын
thanks for the additional info!
@okeania
Жыл бұрын
Im desperately looking for this .7x reducer but still nowhere to be found. That's why I heard TS CCD47 .67x reducer for RC scopes works on EdgeHD 800 scopes so I ordered. Will see if it's gonna work or not. Actually there is a website shows that is working already if u are not sure about it.
@AstroForumSpace
Жыл бұрын
Hi there, the .7 reducers are in stock in Europe: bit.ly/3pvopON
@okeania
Жыл бұрын
@@AstroForumSpace OMG thank you but its too late now. If mines work itll be cheaper anyway. Thanks again how I miss that site, cant believe :)) 👍
@martynh5410
3 жыл бұрын
Yes I’m considering getting the 0.7 reducer for my C8 EdgeHD. It’s a bit pricey, so I’m waiting a bit to save up for it. I’m also going to need a better imaging camera and a proper go to equatorial mount versus the single fork arm one that the EdgeHD came with. Perhaps the Celestron Wedge would work well enough?? Great clear video by the way and I do enjoy visiting the Netherlands (been to Amsterdam probably 25 times!).
@AstroForumSpace
3 жыл бұрын
Thank you Martyn! I live in Utrecht, about 30 km from Amsterdam:-). The wedge definitely will improve your tracking, but I've heard that it cannot beat a true equatorial mount. And yes, Astrophotography is a moneypit. I would first go for a good EQ mount. If your tracking is accurate, you can start taking long exposures and that really improves your pictures. Good luck, clear skies!
@sketch6995
3 жыл бұрын
Good luck finding one........Amazon has 1 now.......if you hurry
@OlliesSpace
3 жыл бұрын
It is very pricey indeed one thing that is putting me off the Edge HD
@sketch6995
3 жыл бұрын
@@OlliesSpace that and you cant find one anywhere right now.......
@OutlandishJourneys
3 жыл бұрын
Amazingly helpful, Wido! Just got a surprise early birthday present of an Edge 8 HD and was researching the best way to sort out my imaging train! Your videos and tutorials are marvellous and extremely helpful, so keep up the great work! Best wishes from Scotland! :)
@AstroForumSpace
3 жыл бұрын
Thanks for the positive feedback! Hope you'll have some clear skies in Scotland!
@luciennone6757
Жыл бұрын
Hi Wido, im new to the channel and have a question at the end of the video you measure the length of the back focus, i see you dont measure from the end of the tread, were do you start measuring on the edge 8, from the end of the thread or at the beginning of the thread at de reducer side?
@AstroForumSpace
Жыл бұрын
If i remember correctly...it was 105mm from the thread of the reducer to the camera sensor. Good luck!
@galbanese7329
3 жыл бұрын
The reducer helps for sure but still does not increase the field of view enough for larger targets with my 8" SCT. I am thinking about buying another scope with a wider field of view. I have been looking at the Explorer Scientific Comet hunter and the Orion ED80T ......It's only money, can always make more....
@AstroForumSpace
3 жыл бұрын
Hi, yes. I really like my 80/480mm telescope for widefield pictures (larger nebulas). Clear skies!
@amranackerman9656
Жыл бұрын
Can I add the celestron 6.3 reducer together with this reducer or is that not going to work
@AstroForumSpace
Жыл бұрын
No, you need either a .7 reducer or the hyperstar.
@Dudleydogg
2 жыл бұрын
I just ordered the Edge 800, and the Focal Reducer. going to try OAG wish me Luck LOL, 105 or 133mm for back focus now I see conflicting info
@AstroForumSpace
2 жыл бұрын
Good luck! It's 105mm for the 8 inch.
@Dudleydogg
2 жыл бұрын
@@AstroForumSpace Yes I see that now with Reducer 103 with out 133 I believe I understand that now. Thank you so much for the reply.
@psegre
4 ай бұрын
Viewers should know that the website for the edge HD 0.7 reducer says the back focus is 146mm, not 105mm like you’re saying here. Of course you never demonstrated that 105mm actually works in this video, I guess you never checked to see.
@sreeshab4093
Жыл бұрын
great video. i just bought an Edge 8. and 2600MM with zwo 2 inch EWF and optolong 3nm 2inches SHO and LRGB filters. I also have 0.7x reducer. and 174mm mini guidecamera. need some help for guiding setup. i need clarifications for the following: 1) which OAG is better suited zwo OAG-L or Celestron OAG? 2) would the new camera 2600MC DUO work well for Edge 8? Pls advise.
@FredLombardo
3 ай бұрын
I just bought the .7 reducer today, after 2 attempts at imaging at F10 and meeting with failure due to not enough stars for stacking. I am hopeful that the reducer will correct my issues. Until now, I’ve only images with HyperStar, F2 and the images are too small for some targets.
@Ronbo765
2 жыл бұрын
My 8" EdgeHD white paper has the backfocus at 133.35mm. Not 105mm. Thanks.
@AstroForumSpace
2 жыл бұрын
It has to be 105mm for the edge hd 8". Check: www.celestron.com/products/reducer-lens-7x-edgehd-800
@Ronbo765
2 жыл бұрын
@@AstroForumSpace ahh yes, with the reducer lens on the 8". The larger EdgeHD's have the same back focus with the reducer! Thanks for the correction !
@t0yahoi
3 жыл бұрын
I think you measure it wrong - at 11:05 it looks like you start at the end of the thread. Correct measurement is from the very top of the reducer. E.g. you have not enough backfocus in that image
@thefirstandroiduser6956
3 жыл бұрын
According to the instructions you are right there. And the 6.5 mm back focus of the camera must also be taken into account. @AstroForum: I recommend a caliper for back focus measurements. It really depends on the millimeter ;-)
@AstroForumSpace
3 жыл бұрын
Hi there, I've measured it from the end of the reducer. Clear skies!
@AstroForumSpace
3 жыл бұрын
@@thefirstandroiduser6956 thanks, yes. I've checked the zwo manuals and asked an astroshop, clear skies!
@realmcerono
3 жыл бұрын
@@AstroForumSpace backfocus is not correct with your setup vido. You have actually 111.5mm but as long as your stars are still round in the edges... how is guiding without an off axis guider so far?
@stephentaylor5132
3 жыл бұрын
Just ordered this reducer last night. Won't be getting for 6 months of course. No big deal because my 925 wont be here for 6 months either lol.
@AstroForumSpace
3 жыл бұрын
Yes, the whole world wants to get into Astrophotography. One of the few hobbies you can perform at home in complete solitude. Hope your gear will be delivered asap, thanks and clear skies!
@stephentaylor5132
3 жыл бұрын
@@AstroForumSpace I randomly came across this hobby about 2 months before the chaos began. So, at least I got enough equipment to image before the real shortages began.lol
@thierrymartin8378
7 ай бұрын
Celestron Edge has a field of curvature much less than the classical SCT Celestron . It is not a flat field telescope. Only a Slevogt Schmidt Cassegrain is nearly Flat field telescope. This is a confusion with an aplanatic telescope or coma and Spherical aberration, free telescope. The reducer for Celestron SCT Edge doesn't touch the Coma and the spherical aberration, but improve the chromatism , the field of curvature and the stigmatism.
@chrisdumas4352
Жыл бұрын
Can you add a link for the extender you are using? Just ordering an EdgeHS 8". Great video...thanks!
@jean-marclemoine9636
3 жыл бұрын
Hi. I’m using the C8 Edge HD with this reducer but with my camera and filter wheel behind, the focal lens is exactly 1443mm after a plate solve. Not 1422mm. Anyway it’s wider and I’m happy with it. Clear skies and enjoy your C8. It’s a nice telescope. JM
@AstroForumSpace
3 жыл бұрын
Sound good Jean-Marc! Thanks for the info. Hope I'll get that little bit of extra field of view.
@spencerstevens4191
Жыл бұрын
Great video. Always impressed with how knowlegable the Dutch are regarding optics. Guess it make sense since the dutch invented the telescope and the microscope. Oh, and the CD, of course.
@philfastmike3496
2 жыл бұрын
A stupid question since I am thinking about buying a Celestron 8" or 9.25". In direct viewing to observe planets, will the quality be really better compared to my Nikon P1000 camera chich cost less than a quarter of those telescope with a maximum focal lenght of 3000mm???
@AstroForumSpace
2 жыл бұрын
Yes, definitely. The p1000 is cheaper and easier to setup, but that camera is not optimized for night sky observations. It depends a bit on what you're looking for. If you just want to have a bit of fun, the p1000 will do. If you're looking for high quality images, you'll need a planetary scope with a large aperture and focal length. FYI: kzitem.info/news/bejne/2Kd9y66as193dY4. Cheers!
@philfastmike3496
2 жыл бұрын
@@AstroForumSpace You are great! Thanks for your valuable input! I am not in spending hours stacking images to be able to see something but wanted to look directly to things. My P1000 give me some pretty good results for the moon and barely acceptable photos of Saturn, but nothing sharp enough and I wanted to be sure that an 'expensive' telescope will aloow me to see more then just 'white spots' in the sky....
@AstroForumSpace
2 жыл бұрын
Glad to help! Perhaps this is useful, my video about planetary telescopes: kzitem.info/news/bejne/2Kd9y66as193dY4
@philfastmike3496
2 жыл бұрын
@@AstroForumSpace Top! Thank you very much!
@noreaction1
2 жыл бұрын
Have you tried mosaic imaging?
@AstroForumSpace
2 жыл бұрын
Only once
@christopherdeaver5372
3 жыл бұрын
Can you start posting some of your videos on Rumble. Many of us are moving to that platform because of censorship on KZitem.
@AstroForumSpace
3 жыл бұрын
Never heard of it. I'll take a look.
@oldnordy2665
Жыл бұрын
What censorship? Rumor or lame conspiracy theory?
@mgastronomy
3 жыл бұрын
Nice video ouido. I have the same scope and focal reducer. I did not have the extension tube to attach my dedicated astronomy camera to it. I have used several extensions that are not rigid. Your one piece extension is definitely the solution for my problem. I hope to get it soon and start imaging from my deck. Cloudy skies here in Toronto. Thank you for posting. Clear skies
@AstroForumSpace
3 жыл бұрын
Thanks AstroDeck! I used several extension rings, the one connecting the filterwheel to the rest of the imaging train came with my zwo asi1600mm camera. the rest of the extension rings I bought separately, including the sct to 2" adapter. Hope you'll have some clear skies soon!
@OlliesSpace
3 жыл бұрын
Look forward to seeing some images with your new toy. I am actually waiting on my 0.8 reducer/flattener for my 80mm refractor. I was actually sent the wrong one, very annoying as I can a currently only take small objects in the centre of my frame because of the way the stars look without a flattener.
@AstroForumSpace
3 жыл бұрын
Thanks Ollie. Yes, a flattener definitely helps, you'll need to check out the correct back focus. Hope you'll get those round stars! Best, Wido.
@OlliesSpace
3 жыл бұрын
@@AstroForumSpace Thanks Wido yes looking forward to it, it's a standard 55mm backfocus so should be good. Wido have you tried our Australian based space podcast kzitem.info/news/bejne/lZ5tyn-djX9zpo4 you may like it. 👍👍
@robertchandler2218
3 жыл бұрын
Can you also advise the bracket that you have used for your guidescope please.
@AstroForumSpace
3 жыл бұрын
I've bought this one for my Orion mini guidescope: www.teleskop-express.de/shop/product_info.php/info/p300
@robertchandler2218
3 жыл бұрын
Thank you again. There are a few holes in the clouds at the moment.ent so I am hoping to get some images on the 120ed
@No_More_Wrath
9 ай бұрын
That’s not a review, it’s an explanation.
@mobsterduck8315
3 жыл бұрын
I have a Celestron C6 with a .63 reducer but always end up having to crop out a lot of the image because of the rounded stars on the edge of the FOV
@gazza9839
3 жыл бұрын
The C8 edge reducer gives good stars to the edge if you get your spacing correct.
@AstroForumSpace
3 жыл бұрын
I did a quick test last Saturday under terrible weather conditions. I'm hesitating to share the results of my M81 attempt at half moon under cloudy city skies, but...long story short, the imaging train worked and I got nice in focus stars across the FoV with the setup shown in the video. Clear skies!
@sketch6995
3 жыл бұрын
Just got my reducer from Amazon. 2 popped up for sale out of the blue and I was quick on the trigger. Now to choose a camera. I have 2000 to spend and those red ZWO's are pretty. What would you recommend?
@AstroForumSpace
3 жыл бұрын
Hi there, congrats. As for zwo, i made this video on zwo color cameras, perhaps useful: kzitem.info/news/bejne/zISCl2ajfJSToG0 clear skies!
@paolopastorelli1566
3 жыл бұрын
where did you buy that amazing hoodie???
@PlayStore-mi7gb
3 жыл бұрын
Great video, Too bad these things are backordered through the next century!
@malanstecker
3 жыл бұрын
Great review! Where online (URL) do I get the field of view calculator? Currently I have a Canon SL1 (cropped sensor) camera and would like to know the field of view with this camera for my C11 f/10 SCT, Astro-Physics 155 mm f/7 EDF, Astro-Physics 130 mm f/6 EDF and 73 mm f/5.9 William Optic refractors.
@AstroForumSpace
3 жыл бұрын
astronomy.tools/
@astrocapetown4955
3 жыл бұрын
Nice video. One point worth mentioning is that the actual native focal length of the edge had 800 is 2125mm (according to the white paper). This can be confirmed by platsolving, once you have nailed down the 105mm backfocus.
@AstroForumSpace
3 жыл бұрын
Hi again, do you mean 2125mm? I did notice that I got a bit more focal length then I was expecting when aiming at the moon. It didn't fit the whole moon into a single shot with my asi1600mm, so I think you're right in saying that the focal length is a bit longer than advertised. Clear skies!
@astrocapetown4955
3 жыл бұрын
@@AstroForumSpace it definitely is. When you plate solve at 105mm back focus you get 1488mm which is correct.
@hottokatrazi
3 жыл бұрын
for visual observing, would you recommend getting the 2“ eyepieces with a 8“ sct?
@AstroForumSpace
3 жыл бұрын
Yes, or connect a camera :-).
@dmpase
3 жыл бұрын
I have both 1.25" and 2" eyepieces, and I find the 2" eyepieces to be better, larger field of view, more comfortable viewing, whether the telescope is large or small.
@foxglovemead
3 жыл бұрын
2" widefield EPs will benefit the 8" SCT when their field-stop is wider than the same FL on a 1.25" EP. However, for smaller focal length EPs, the limiting factor is the field stop and not always within the EP e.g. with the baffles/tube assembly in the scope. For smaller focal length EP you won't see any benefit and there will be increased weight and cost considerations. Celestron supply a 40mm Plössl with the EdgeHD 800 with a relatively narrow AFOV. Using a widefield bigger/longer EP will not give any increase in FOV because of the baffle in the scope. For smaller focal lengths a 1.25" EP with a 1.25" adapter is cheaper/lighter anyway without any disadvantages of the 2" equivalent FL.
@Desertskyobservatoy1925
2 жыл бұрын
Historically, I've been using a Hyperstar with my Celestron 8" since I was imaging with a fork mount. I recently purchased an Edge 11" with an EQ mount and I'm wondering if there are any benefits to using a .7 focal reducer compared to the Hyperstar or vise versa. Great information and thank you!
@AstroForumSpace
2 жыл бұрын
Hi Steve. A .7 reducer would allow you to shoot at a longer focal length than your hyperstar setup, but you'd also need to increase your exposure time as you're shooting at f/7. You'll need a good equatorial mount and guiding for accurate tracking.
@ai5dd
2 жыл бұрын
If I ever get my Celestron 9.25 VX, I definitely will. The lead time is 10 months right now after ordering.
@AstroForumSpace
2 жыл бұрын
I feel for you! Yes, most astrogear is delayed and more expensive due to limited production (covid) and more expensive transportation costs.
@malanstecker
2 жыл бұрын
How does one setup the EdgeHD telescope with .7x reducer for visual use without a camera?
@AstroForumSpace
2 жыл бұрын
Hi Michael, if you're going for visual then I would keep to the original focal length and first target an object with the finderscope.
@billoconnor2727
8 ай бұрын
I WANT the .7 Reducer.
@gazza9839
3 жыл бұрын
Hi Wido, the 1600mm has 6.5mm to the chip, you also need to measure from the front of the reducer not the neck. you're probably not too far out but not quite :-)
@AstroForumSpace
3 жыл бұрын
Yes, thanks. I took that into account. 6.5mm to the chip + 20mm for the filterwheel = 26.5mm. clear skies!
@gazza9839
3 жыл бұрын
@@AstroForumSpace ok just looked wrong when you had the measuring tape on the side
@markbuxton2368
3 жыл бұрын
Great timing! My first night out last night with my EgdeHD 8 and 0.7 reducer. The moon frames perfectly with my APS-C camera. Took some images of M42 too, but not with filters fitted yet. Some issues with vignetting with 1.25" filters according to what I've seen on other reviews. I've fortunately a 2" filter drawer but need to get the right backspacing before I can test that. Great video, thanks and best regards from the UK
@AstroForumSpace
3 жыл бұрын
Hi Mark, great! I just used my .7 reducer with filterwheel and 1.25" this weekend. Was expecting vignetting to be an issue but that was not such a big issue. Weather conditions were bad unfortunately. Hope we'll have some clear skies soon!
@sketch6995
3 жыл бұрын
Sorry to bug you again brother but could you link me to the spacers you used to achieve 105 mm of back focus? I'm unsure what ones I need. The ones I have are M42. They are too small.
@robertchandler2218
3 жыл бұрын
Thank you for the video. I bought the edge hd 8 as a christmas present to myself. I also have the f7 reducer and the t adaptor but was told I didn't need any more spacers. Needless to say I have been extremely frustrated and between the holes in the clouds I have been using it visually only. I am going to be on the phone first thing tomorrow.
@AstroForumSpace
3 жыл бұрын
Hi Robert, that's unfortunate. I've read the instructions that came with the reducer and asked some experts, I'm pretty sure it needs a 105mm backfocus. Hope you'll be able to sort it out. Weather here is terrible ATM but I'm going to try this asap. Cheers, wido.
@robertchandler2218
3 жыл бұрын
@@AstroForumSpace I too read that but I was assured that I would be ok. Maybe it is why the weather is still bad if we keep on buying new toys. I have just added your hoodie to my list as well. Stay safe.
@AstroForumSpace
3 жыл бұрын
@@robertchandler2218 LOL, thanks!
@davidfottrell8668
3 жыл бұрын
Hi Robert, I have an Edge HD with 0.7X reducer, but the 105mm back focus is not negotiable. I experienced this the hard way with severe streaking for 60%+ of the imaging field. I have tried various combinations of T-adapters, but could never quite get closer the 3-5mm, the tolerance is 105mm +/- 1.5mm. I have partially solved the problem using a Baader variable focus adapter, but I realised after that I need a T2 adapter to connect this to the 0.7X reducer. Unfortunately, I live in Ireland and all the suppliers insist on supplying from the UK...with BREXIT, that's taking 4 months plus with huge added costs! I'm debating whether or not to bother this year. but that's another discussion! Basic advice is that this will not work if you do not carefully work out the backfocus of your imaging rig and get appropriate adapters to give you as close to 105mm as possible. Once you have that, it is an amazing setup and will give you years of happy imaging!! Clear skies :)
@robertchandler2218
3 жыл бұрын
Thank you all. I have been on the phone most of the morning g and still haven't got it working as shown in the video. The stupid thing is that when I reconnect the diagonal and put the camera in where the eyepiece is supposed to go I get an image aaarrrghhh.
@anthonygraham6449
3 жыл бұрын
So more questions if you don’t mind. So this is what I will be working with. Zwo 2 inch filter wheel ( can’t tell the one you have in the video) zwoasi294 Mc pro, celestron .7 reducer. Ok so here’s my question. Will I need any of those 42 to 48 adapters. I got the T adaptor that’s for the c8 hd. It’s different then yours so not sure of the threads. I imagine they are the same. But who knows lol. I hope it goes together as clean as yours did.
@AstroForumSpace
3 жыл бұрын
Ah, I'll have to check as I made this video a while ago. I could send you the exact list of spacers and adapters ordered, but I have a 1.25" filterwheel. Might be similar size, don't know.
@anthonygraham6449
3 жыл бұрын
@@AstroForumSpace thanks that’s ok. Between the camera and filter wheel I should have what I need. We shall see. They still no idea when it will get back in stock anyways.
@foxglovemead
3 жыл бұрын
Good video. I also have the EdgeHD 800 and 0.7x Reducer. For your viewers, you may want to explain that back focus is a critical measurement, measured from the back surface of the 0.7x Reducer (not including the threads). The EdgeHD 800 has a focal length closer to 2125mm (not what it says on the front of the scope). Celestron offers EdgeHD, 0.7x Reducers, and an Off-Axis Guider (OAG). From this list, you can sometimes only use any two of the three. The image circle of the EdgeHD 800 is about 42mm and the 0.7x Reducer reduces this to 26mm which limits the size of the sensor you can ultimately use. You can't easily use a DSLR with the OAG and 0.7x Reducer. Celestron OAG offers a clear aperture of 60mm on the larger 0.7x Reducers but only 35mm on the EdgeHD 800 (2" vs 3.25" form factor) and the OAG has a minimum prism center height that is 15mm. Compare 35mm to 26mm to 30mm and you will see why (when looking into their OAG) that half the image circle is cut-off. Fortunately, there are other "thin" OAG e.g. from QHY, ZWO, and others which will work with your existing kit (and refractors with a Reducer BF of perhaps only 60-65mm), which greatly widens the choice of what you can use. Without an OAG you may find EdgeHD 800 astrophotography difficult/frustrating. The 0.7x Reducer will initially make the task a lot easier. Simon
@AstroForumSpace
3 жыл бұрын
Hi Simon, thanks for all the info. I would not recommend the Edge HD for someone who just starts out in astrophotography - a smaller refractor is much better as it affords more inaccuracies in guiding without ruining your pictures. I did some initial tests this weekend with the .7 reducer with the filterwheel and camera and a "traditional" guidescope on the telescope, actually I used my small 50mm orion guidescope which is a bit on the short side in terms of focal length, with my zwo120mc. I was still happy with the results I got with 3 to 5 minute exposures, stars were not perfect, but pretty round in sub-optimal weather conditions. Thanks again and clear skies!
@foxglovemead
3 жыл бұрын
@@AstroForumSpace The two "locks" on the EdgeHD 800 are more like "clutches" so they help up to a point. If you have a focuser then small adjustments can be made whilst "locked". OAGs are not that difficult - I never tried guiding without one. 290 (I have a 178) has a small sensor that would pair well with a ZWO OAG or similar (not Celestron). I use OAG for a refractor, SCT, a wastepaper bin, etc. and stars are perfectly round. You could compare unguided with guided times to gauge the effectiveness of guiding and even with polar alignment off. Where you point the scope determines the movement of the mirror - probably when you least want it, too! No "wastepaper bins" btw. Simon
@w8bya
3 жыл бұрын
Hi Simon. I am having a senior moment here and wondering if you could clarify something you said above. You mention the 800 having an image circle of 42mm and only 26mm with the 0.7X FR. For some reason I keep wanting to think that the image circle would become larger with the FR since the FOV is greater. Can you clarify that for me? The reason for my interest is because I have a new to me EdgeHD 800 and want to use it with a FF Canon DSLR. I am trying to figure out the optimum couplers to minimize vignetting. I realize with a FF sensor I will have plenty but this is the camera I already have. Thanks
@foxglovemead
3 жыл бұрын
@@w8bya There are two issues with FF and 0.7x Reducer: BF is 105mm but an attached SLR is more e.g. 111mm. The image circle reduces to 26mm. For FF the EdgeHD 800 is OK without the 0.7x Reducer. Celestron could explain this (better) in their manual/product description? From their website (the issue): “The EdgeHD optics are designed to optimize an image circle 21mm in radius from the center of the field of view. Doubling this figure gives an image circle 42mm in diameter. This is big enough to illuminate a 35mm sensor. The OTA's image circle extends well beyond the formats of popular APS-C sensors found on many DSLR cameras and many smaller chips used in specialized astrophotography CCD cameras. If you are using one of the .7 reducer lenses for either the 1400 or 1100 Edge HD optical tubes, the diameter of the image circle will remain at 42mm. If you are using the .7 reducer lens for the 800 Edge HD the image circle will will shrink to 26.7mm in diameter. The shrunken image circle will fully illuminate a cropped DSLRs (APS-C) senor or smaller CCD”. Hope that helps. Simon
@w8bya
3 жыл бұрын
@@foxglovemead TU kindly for your reply. When you said "BF is 105mm but an attached SLR is more e.g. 111mm. The image circle reduces to 26mm." Is this reduction in image circle due to the BF being increased from 105mm to 111mm alone or are there other reasons? Also you said if you use either the 1100 or 1400 Edge scopes with the 0.7X FR the IC will remain at 42mm, is this because those scope use M48 sized coupling whereas the 800 uses only M42? I accept your answers to be accurate but I still do not understand why the IC drops when the FR is used with the 800. Can you maybe point to a URL or maybe show a simple ray diagram illustrating the reason? I appreciate your time in explaining this but so far I still do not understand WHY this is happening. TU
@astrocapetown4955
3 жыл бұрын
Did you take into account that the reducer lens screwed into the extender? If not, you need to add another 12mm to compensate.
@AstroForumSpace
3 жыл бұрын
Hi Astrocapetown, I just did a first test this weekend and the 105mm setup worked fine. I didn't take into account an extra 12mm for the potential distance between the thread of the .7 reducer and the actual reducer lens...Clear skies.
@rickeyparker8582
3 жыл бұрын
Purchased a .7 reducer for my 9.25”HD Celestron telescope. However, when I tried to remove it i found it could not be removed. The reducer was stuck on the back of the telescope. I purchased a strap wrench from Amazon to remove it without damaging it. When it came off it took the backplate adapter with it. Without this adapter the telescope was useless. The solution I found was to purchase some medium bond lock-tight and put a little on the threads of the back plate adapter stuck to the reducer then screw it on the back of the 9.25” back. I let it set overnight. And then tried to remove the reducer with the strap wrench. Modest pressure removed it from the backplate adapter. Problem solved!
@AstroForumSpace
3 жыл бұрын
I've the same issue with my filterwheel and extension ring, can't get it removed. Clear skies!
@rickeyparker8582
3 жыл бұрын
Just use a rubber strap wrench and you can apply equal pressure around the unit without damaging the item. The idea with the use of lock-tight came from cloudy skies!
@Mobius3c273
3 жыл бұрын
I love your helpful videos :-)
@AstroForumSpace
3 жыл бұрын
Thanks!
@hasanonen2447
3 жыл бұрын
This has cleared a lot of issues! Thanks
@AstroForumSpace
3 жыл бұрын
Glad I could help!
@hasanonen2447
3 жыл бұрын
@@AstroForumSpace Can you please link your t2 adapter with 3 parts. Im want to integrate an OAG as well. Thankss
@walterlewis1029
2 жыл бұрын
Hi Wido I Ordered the Focal Reducer will be delivered on 07/21/22 can't wait to try it.
@AstroForumSpace
2 жыл бұрын
It worked out great for me. Hope you'll have a good time with that reducer, clear skies 😉!
@walterlewis1029
2 жыл бұрын
Hi Wido, Which Auto focuser do you use with your Celestron Edge HD scope.I have 9.25 Edge HD I love OPT.
@MegaGaggu
3 жыл бұрын
Is it good idea to buy 0.5x reducer for F6 ratio Newtonian?(8 inch)
@NGC-catseye
3 жыл бұрын
How many astronomers does it take to attach a reducer? 🌌🔭👀
@AstroForumSpace
3 жыл бұрын
uhhm...I hope only one, but I guess this is the start of a good joke, hehe.
@prnzssLuna
3 жыл бұрын
Celestron does a horrible job documenting the backfocus of their scopes. I still have no idea what the backfocus of my C9.25 (Non-edge) without reducer would be, for the .63 and .4 reducer I luckily found enough stuff online :D. So I use it exclusively with reducer :'D. They should really fix that :'D.
@AstroForumSpace
3 жыл бұрын
Yep, I pointed my C8 to the moon and turned the focusser, took me a while to get it into focus with the reducer :-).
@prnzssLuna
3 жыл бұрын
@@AstroForumSpace the thing is, there *should* be a 'correct' backfocus for any scope, just reaching focus doenst really tell you whether you're right or not, as it might compromise the optical performance or mess with focal lenght and f-ratio n stuff. But I rarely see manufactures making those figures public, even tho they have them, which really sucks :D
@AstroForumSpace
3 жыл бұрын
True. You know your stuff Luna! Based on my own calculations, I was expecting a different FoV so I'm probably at a longer focal length...ah well, live and learn.
@prnzssLuna
3 жыл бұрын
@@AstroForumSpace Hey, thanks :) Just hours upon hours of research during bad weather. Trial and error would probably be the best way to find out about the correct backfocus, but it takes forever and is very tedious work, so I just accept slight discrepancies.
@galbanese7329
3 жыл бұрын
I have the Celestron 8" SCT with a 0.63 reducer
@siegfriednoet
2 жыл бұрын
Hey Wido, Great information ! where did you get the adapter sc thread to M48 ?
@AstroForumSpace
2 жыл бұрын
Are you in europe or USA Siegfriet? I ordered mine here: bit.ly/3DHbDpV
@DavesAstrophotography
3 жыл бұрын
Thanks, nice summary. I've got my .7 reducer waiting for me at home, it was on back order for ages. One question I have never been able to find an answer to, why is f/10 to f/7 considered 1 full f stop? I still need to wrap my head around the math associated with light gathering equivalents etc...
@AstroForumSpace
3 жыл бұрын
I tried to find the equation for this video, but couldn't find it. I did find this reference chart: havecamerawilltravel-com.cdn.ampproject.org/v/s/havecamerawilltravel.com/photographer/f-stop-chart-lens-apertures/amp/?amp_js_v=a6&_gsa=1&usqp=mq331AQHKAFQArABIA%3D%3D#aoh=16112992853014&referrer=https%3A%2F%2Fwww.google.com&_tf=Van%20%251%24s&share=https%3A%2F%2Fhavecamerawilltravel.com%2Fphotographer%2Ff-stop-chart-lens-apertures%2F. Cheers, wido.
@w8bya
3 жыл бұрын
Have not looked at the link below but you can always see what the light difference will be by squaring each f-number and dividing one by the other. So in this case if you take f/10 (you square 10 to get 100) and then take f/7 (and square 7 to get 49) then divide 100/49 you get 2.04. This is close enough to 2 which means that you are letting in twice as much light at f/7 as you are at f/10. A full f-stop is defined as changing the light by a factor of 2 which is what we have here.
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