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About dan_adi

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    Astronomy, Medicine, IT
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    Above the Clouds

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  1. Very impressive refractor! How are the views? I received my 8 inch frac a few weeks ago, but in my area winters are mostly cloudy, and I can't test it :(, the suspense is killing me :)) hope spring comes early
  2. CCD photometry could be a solid reason for the SCT. Did you find mirror shift/flop to be an issue in photometry? I'm guessing with shorter exposures the impact will not be important? I have to say, the SCT drove me in the hands of a big refractor, and I might become a refractor man for life, if only the clouds will go away
  3. For a while in college I had an 10 inch DOB. That scope impressed me almost every night. Glad to see others had similar experiences!
  4. After 2 or maybe 3 years with an 12 inch Meade SCT I started to wonder what I was thinking Most certainly it was aperture fever, but I did not find the scope to excel at anything. Visually the views are average, DSO imaging is a pain with mirror shift, focusing by moving the mirror..etc. The only thing we use SCTs are planetary imaging? Why did you guys get an SCT? And what are you using it for? Are you happy with it?
  5. Don't mind me asking but why buy such a big SCT? In my case (with the 12 inch SCT) it was aperture fever, and lack of knowledge, and lack of experience .. :)) . I am at the point when the only thing I would use it for is planetary imaging. Perhaps I am just curious why we buy SCTs..?! On topic. I didn't need to clean my corrector plate, but the youtube videos are very informative. You should give it a try
  6. Have you considered CFF refractors? Top quality, same as TEC or APM-LZOS. Their 140 mm APO is around 6000 EUR, close to your budget. They make their own field correctors (flatteners), and even adaptors for your camera. I received my 8 inch last week from them, but its been cloudy and rainy ever since so I can't test it, but from exterior inspection everything is perfect. https://cfftelescopes.eu/product/refractor-140-mm Or if you want a triplet with some fluorite in it check https://www.astro-theke.de/astro-optik-manufaktur/produkte/, Their 135 mm is around 7000 eur if I recall. (I
  7. I totally forgot to check if the focuser has a rotation feature :)) This is what happens when I m to tired, the neurons stop firing properly :))
  8. Thank you for the detailed response. The manual rotator is not really a big necessity anyways, and I didn't think I can just put the rotator in front of the flattner if I really want to use it . The scope is f 6.5 at 1280 FL, so with the above calculation, the optimal distance prism to guide-sensor would be 52 mm. And I assume the same distance applies to prism - main imaging sensor.
  9. Well I have 90 mm at disposal between the flattner/corrector and the ccd sensor. I was looking into Optecs motorized Sagitta OAG but it eats up 31.7 mm. The G3 with filter wheel eats up additional 47 ish mm and I have a manual rotator with about 30 mm... So I am over the limit with Optecs Sagitta. Would it be a bad ideea to place the OAG before the flattner?
  10. Hello, What do you consider is best for a refractor with a FL of 1280 mm, guidescope or OAG?
  11. Thanks, in the near future I am hoping to get some Chroma filters too.
  12. Hey, where did you order the filters from? Directly from Chroma's website?
  13. Vlaiv gave an exceptional answer. I did try to image with a 12 inch SCT and a Mesu mount. I found it very frustrating, not because of the mount, but because of the scope. The 2500 focal length was too much, minor but evident mirror shift after a merdian flip, minor but evident shift if you focus by moving the mirror. I am going the refractor route myself. If you want a mirror scope, that's just fine, but pick one with a stable mirror like an RC or a CDK.
  14. Hey, a mesu 200 user here. The mount is a great value for the price. The sitech 2 controller has a learning curve, but on the sitech groups you will find help fast. Also mr. Mesu himself answer any email as soon as posible. The sitech software incorporates mount modeling. With modeling you get better pointing accuracy and tracking. I did try different models just to learn the software, and the best rms value I got was 17 arcseconds (that is very good for a mount with no absolute encoders). Mount modeling is best done with a rigid imaging gear aka a refractor on the mount. When I tried modelin
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