Thanks for the thorough review. The chromatic aberration you showed could have been atmospheric dispersion. Checking how it varies across the field and on other targets at other altitudes would tell the tale. As well as checking the scope visually for longitudinal CA. But the images seem to show off-axis lateral CA, which could be from the Reducer optics. Or the atmosphere! A single test image is not always the best to pass judgement on -- or in your case, asking us to do so. We need more evidence!
@derekbaker3279
2 ай бұрын
Thanks for the review Cody!👍Here are a few of my opinions: 1. It's nice to see a fast scope with reducer that appears to illuminate a 44mm circle without brutal amounts of vignetting! And, yes, it is a very user-friendly package! 2. It's unfortunate that the reducer introduces a lot of colour error. I have a hunch that it has no extra low dispersion glass in it. 3. IMHO, you were dealing with some tilt in the system, because the parts of the field with distorted stars changed after you added the reducer to the system. 4. FWIW, we need to keep in mind that the ZWO 2600 MC duo has 3.76um pixels, while the Canon R8 has 6.00um pixels. That means the test of the optics with a full frame sensor was much more forgiving than it would be with, say, an IMX455 sensor, e.g. ZWO 6200MM or 6200MC camera. The IMX410 sensor (e.g. ZWO 2400MC) has pixels which are similar in size to the R8, so those who are happy with the resolution & performance in your test with the R8 may want to consider using an IMX410 based camera over an IMX455 based cam. 5. Generally, the saying 'you get what you pay for' does apply to telescope optics, and the fact that the Founder Optics Draco 62 is just a bit more than half the price of the William Optics Pleiades 68 is reinforced by your carefully done, thorough testing. The Pleiades 68 has similar specs to the Draco when the Draco reducer is used, and I do not recall seeing any examples of the f3.8 Pleiades 68 producing colour error like we saw from the Draco at f3.9.
@AstroBlender
2 ай бұрын
Hi Derek, 1) Agreed! I did not take any flats because I wanted viewers to see what kind of vignetting they could expect. Not seeing much was a pleasant surprise. 2) I also agree here. When I inquired about the glass I was told one element of FPL-53 and one element of FPL-55, with the rest being ED glass. I imagine extra low dispersion glass in the reducer would have increased the price above the target (just my speculation). 3. Yep, still not too bad for no adjustment out of the box. I expect with some tinkering you could get good corners with a full frame sensor (as I mention at the end of the full frame sensor analysis). 4. This is a good point. I expected the Draco 62 to be optimized for sensors APS-C and smaller. Even with the R8s large pixels, I was pleasantly surprised that it performed pretty well with a full frame sensor. I do agree though that the smaller pixels in the IMX455 would be a better test, but I’m limited to what I’ve got, unfortunately! As a side note, I think the thing that impressed me the most with the Draco 62 is it’s performance and included accessories at its price. The $900 pre-order price from a few months ago was an absolute bargain, and the $1100 price currently I still think is great for a budget refractor that gives good performance and comes with so many accessories. Thanks for your thoughts!
@desmcmorrow2978
2 ай бұрын
Thanks for a thoughtful, honest review. Keep up the good work. Cheers, Des
@AstroBlender
2 ай бұрын
Thanks Des, I appreciate it!
@sf1mk
Ай бұрын
Hi Cody, Thank you for the video. Could you make a comment on amount of vignetting with & also without the reducer + APS-C camera? I assume you used calibration frames on the images you used to evaluate the scope?
@raywinkle1024
2 ай бұрын
hey cody you have great videos. can you do a video on the wedge for celestron 8se. I've seen other ones and they really don't help please. thanks in advance
@AmatureAstronomer
2 ай бұрын
I won't even test anything less than an octuplet refractor!
@AstroBlender
2 ай бұрын
Why stop at octuplet!? Nonuplet??
@EugeneRu777
2 ай бұрын
👍👍👍👍👍👍👍
@bobbymccourt6794
2 ай бұрын
The coloring of one side blue, one side red on the white stars is disappointing.
@40Sec
2 ай бұрын
Especially at that price. I have a Sharpstar 61edph iii triplet which is much cheaper, and it has significantly better colour performance than what was shown here. It seems like there are still some manufacturing issues to work out on this one. I really like the mechanics, so it would be great if they got things in check. Hopefully they'll also provide free service for folks who are running into the issues shown in this video.
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