Great job, Logan. I built an 18" standard Dobsonian over 15 years ago. Ground the mirror by hand. John Dobson himself came to my house and helped do the final figuring of the mirror. He was also kind enough to sign the back of the mirror. Fully upright, the tube assembly stands 9 feet / 2.75 meters tall. It is a heavy beast. Seeing your video has inspired me to take it apart and build a truss tube system instead. That should make taking it out to a decent dark sky site much more manageable. Again, great job. Hope you are getting lots of enjoyment from your scope. That is a big accomplishment. My hat's off to you!
@davepastern
3 жыл бұрын
it'll still be heavy - honeycomb sandwich mirrors are really a great idea, combined with a truss design and lightweight components (aluminium, carbon fibre, etc).
@AustralianAstronomy
3 жыл бұрын
Thanks mate! Wow that must have been a dream come true to have the one and only help you! I actually hope to do up this scope soon enough, unfortunately though I haven't even used it once since the filming of this as I haven't been able to get it coated. Cheers!
@davepastern
3 жыл бұрын
what a fantastic effort Logan - I am mightily impressed with your enthusiasm, knowledge and skills, that far belie your age. It's also great to see a younger person becoming involved and interested in science - it's a rare thing these days. Your parents must be very proud of you!
@AustralianAstronomy
3 жыл бұрын
Thank you very much! It's simply something I enjoy from time to time :)
@tokiyongthwjm3495
3 жыл бұрын
Very true
@urosvelimirovic9309
4 жыл бұрын
Most impressive thing is how you made primary mirror. The rest seems reasonable, but that mirror though. i wouldn't have the nerves for that. Great job.
@GreyGhost-r4z
3 жыл бұрын
Nice Job ! I have built 2 telescopes in the last 30 years. Absolute fun. Congrats !
@AustralianAstronomy
3 жыл бұрын
Thanks! Yes it is good fun and certainly a hell of a way to occupy your time! Cheers
@johnbaligrodzki9672
Жыл бұрын
Okay, I am late to the party but wanted to say how impressed I am with this Dobsonian. Simple solid design for a young astronomer.
@filamentum0372
2 жыл бұрын
This is a great telescope. I'm considering building my own
@mellorides3379
3 жыл бұрын
The fact that 12k people watched and only 263 liked it, means your doing something right. You have almost 11k haters.
@justinbiondi
2 жыл бұрын
Any see this dude going far? Hey you got a knack for these videos. Keep improving and become great!
@3VAudioVideo
4 жыл бұрын
Very COOL!!!
@realmarsastro
3 жыл бұрын
Very nice, making the mirror yourself really saves some serious money.
@CosmologDiraEinstformula
2 ай бұрын
nice presentation
@avecforte8851
3 жыл бұрын
Beautiful work, very impressive
@AustralianAstronomy
3 жыл бұрын
Thank you!
@AtTheEyepiece
4 жыл бұрын
Great job, congrats!
@AustralianAstronomy
4 жыл бұрын
Thanks!
@Sergey_Sergeev
4 жыл бұрын
Great achivement! Congratilation!
@AustralianAstronomy
4 жыл бұрын
Thank you!
@UpcomingJedi
11 ай бұрын
Awesome telescope! Videos like this deserve likes and subscribe even if there is no beggung for them.
@Asifkhan31416
4 жыл бұрын
Well done Logan! nice scope
@niniga2396
3 жыл бұрын
Very smart and nice build scope especially on your age!
@AustralianAstronomy
3 жыл бұрын
Thank you! Cheers!
@dedskin1
2 жыл бұрын
Fantastic work , i mean you are still just a kid , if you made this , soon you will be makeing RC telescopes 1m diameter . But let me ask you as a noob at this , where did you find the grinding machine , or you made that your self as well ?
@MagVair
3 жыл бұрын
Logan? How's the telescope coming along? Have you got the mirror done yet? Have you thought about silvering it yourself?? I'm pondering this very path myself.... Wonderful job!! Love to see an up date!?
@AustralianAstronomy
3 жыл бұрын
Hi, haven't been up to much over quarantine but hopefully i'll be getting back into it after this is all over (If school isn't too hard on me!) Cheers
@MagVair
3 жыл бұрын
@@AustralianAstronomy Carpe Diem 😁👍
@developyourself7514
3 жыл бұрын
Good job..I have a question after making this concave piece of glass. Do you need to finish with a reflective material like nickel? or not ?
@AustralianAstronomy
3 жыл бұрын
Hi, The glass is usually finished with aluminium from a coater. Cheers
@jodyjohnson265
2 жыл бұрын
E/I educational and information.
@h.cedric8157
2 жыл бұрын
Hmm, no silvering for mirror?
@parthd714
2 жыл бұрын
That's a great mirror, I have a question that where do you coat the mirror? Do you coat it on the bottom side or on the curve? If it's coated on base wouldn't that make it a plane mirror with a lens? And if it's coated on curve then how will it reflect?
@jassu1
2 жыл бұрын
Silvering the flat side makes the mirror behave like a concave mirror with a focal length less than that of what it would have been if the curved side was silvered. You can get it coated so that the top of the coated surface is smooth and highly reflective. Check out Physical Vapour Deposition.
@parthd714
2 жыл бұрын
@@jassu1 thanks man
@concernedcitizen780
3 жыл бұрын
I built something quiet similar. I had problems with balance and had to add weight to the mirror box. Took a lot of time.
@AustralianAstronomy
3 жыл бұрын
Yes it is certainly hard to balance these sorts of telescopes. I think this one needed a bit of weight. I plan to maybe make this scope a bit lighter in the future. Cheers!
@concernedcitizen780
3 жыл бұрын
@@AustralianAstronomy there is another option. Use strong springs possibly on a pulley to help manage the weight
@concernedcitizen780
4 ай бұрын
Thanks
@rogerparmeter2574
2 жыл бұрын
BTW I thought it obvious that your doing outstanding work,;-) Good Luck in your endevours!
@TiGuyDuQuebec
4 жыл бұрын
Very good and impressive job! Can you use the telescope before you have the primary mirror coated? Can you gives an idea of the cost of coating?
@AustralianAstronomy
3 жыл бұрын
Hi Guy, yes the telescope can be used but not really for deep sky objects as the view is too dim. Cost of coating is usually not toobad if you know someone who can do it for you on the cheap. Cheers
@TiGuyDuQuebec
3 жыл бұрын
@@AustralianAstronomy thanks for your answer.
@nileshr9
3 жыл бұрын
That has inspired me. Just a question. Silvering of the primary mirror to be done on the polished surface or the other side.
@AustralianAstronomy
3 жыл бұрын
Hi, the silvering is to be done on the polished surface for the least distortion possible. Cheers!
@nileshr9
3 жыл бұрын
Thanks Logan ❤️
@Babayaga-pf5dt
2 жыл бұрын
Good work
@pangrac1
5 ай бұрын
Basic but functional. 👍👁️
@peacemeal3196
3 жыл бұрын
What sort of time frame did it take you to build this? Like how many hours? Also did you have a parts list or guide that you can recommend? Awesome job - my grandfather built one and I too am inspired!
@thesarthakranjan3946
2 жыл бұрын
What are the dimensions of the secondary mirror you used mate?
@deniljose32
3 жыл бұрын
Wow great effort
@jackgibson6902
2 жыл бұрын
Do you have to aluminise the telescope?
@whitehorn5171
2 жыл бұрын
I built a refractor telescope with 700mm focal length with pvc pipe body and I'm 14 years old in 2022
@sunjidahmedsrabon1146
3 жыл бұрын
I want to see planet and nebula with the big telescope
@claudioguendelman
3 жыл бұрын
Dont see nothing...
@Mr.doomsday9000
3 жыл бұрын
You like an Xbox fanboy
@davepastern
3 жыл бұрын
and your point is?
@forester1
Жыл бұрын
Can you gift me a 50mm lens . I cant afford to buy. From Pakistan
@jonas7710
4 жыл бұрын
this looks very impressive! May I ask how much it cost you? (this video just made me think that I might also build my own)
@AustralianAstronomy
4 жыл бұрын
Thanks! I think this scope in total was about 500 AUD.
@russkydeutsch
2 жыл бұрын
Ah, yes, because everyone has a gigantic stone grinder.
@bushcraftandastronomer.3775
4 жыл бұрын
That's so cool making your own telescope! I like how it looks and nice view of Venus too. Next year I should give it a go and build this myself. Hope this telescope gives you great views of the planets and those deep sky objects. I bet M42 looks nice through this telescope and what about the rings of Saturn or the seven sisters. Very useful video to watch and thanks for sharing!
@johnnycash4034
3 жыл бұрын
Hey mate. Just for interest sake, where can I buy a blank from? And whats the biggest size available? Also how much did you pay to have that size mirror aluminized and where did you get it done? Cheers
@AustralianAstronomy
3 жыл бұрын
Hi, apologies for the late response! If you google around for telescope mirror blanks you could probably find one either new or used, and your local astronomy club might have some good resources. For me, I got it done for 50 dollars (IIRC), at my local astro club. Cheers!
@arcvidelos8008
2 жыл бұрын
Nice work there, Logan. I'd agree that the large altitude bearings and the teflon / laminate surface are key to getting smooth motions. Making your own mirror is admirable- hope it exceeds your expectations.
@alecclews
11 ай бұрын
Are there plans for this design?
@aurelienyonrac
4 жыл бұрын
Waw i hope you make more video. I like the Crescent designe 🌙
@AustralianAstronomy
3 жыл бұрын
Thanks!
@Beardiecampers4701
2 жыл бұрын
Fantastic job, I’m looking to build pvc refractors with kids in school. What would be also fantastic if you could make a video on how make the individual pieces (e.g. frames, mirror housing box with specifications that would inspire more people to build and get involved in astronomy)
@rogerparmeter2574
2 жыл бұрын
What adhesive did you use for the secondary mirror? The temperature range here goes from -30f to 100f. Which adhesive is known to handle that kind of range? Anyone?
@mehmetekicitekno
3 жыл бұрын
Very good It was a successful work
@hugoabikaram6305
10 ай бұрын
Very good job!
@sasamladenovic6120
3 жыл бұрын
Wow... 👍
@sonaldey1394
2 жыл бұрын
Great work!!! I just wanna ask that does the open structure get any disturbance from the surrounding lights? And does the closed tube structure solve this problem? GREAT WORK AGAIN.
@eaglestdogg
10 ай бұрын
For truss scopes you can always wrap fabric around the truss section to block light coming in from the sides.
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