15th Feb 2024: Astro Pixel Processor 2.0.0-beta29 released - macOS native File Chooser, macOS CMD-Q fixed, read-only Fits on network fixed and other bug fixes
7th December 2023: added payment option Alipay to purchase Astro Pixel Processor from China, Hong Kong, Macau, Taiwan, Korea, Japan and other countries where Alipay is used.
Ordered. It's not that much money and I can send it back but suspect it will help in any case.
Now, any speculation on why my flats do not eliminate this vignetting -- or, for that matter, the big defect that is on my non-focal-reducer image of Andromeda above?
Thanks much!
- Rich
At the moment not really sure no, these are very difficult to pinpoint as it's hardware specific, I can only suggest some things that might help but I would also advice to check with someone local to you (like a observatory) to go over the setup maybe.
Well, I received my 2" adapter, and I'm sorry to say it did not help with vignetting on Andromeda. Perhaps slightly, I could dig up the image. However, the 2" adapter is a superior setup for regular use and I will be using it in the future.
I suspect that my issue is that I got the cheapest available field flattener/focal remover. I should have spent the extra money for the Celestron one designed for my sct. Lesson learned.
Thanks!
- Rich
PS - in general, I would say that Andromeda is not a good target for my setup with it's long focal length. It is so huge with nebulosity everywhere that it highlights vignetting and makes background subtraction very difficult.
Oh that's a pitty, good it does help in the setup though! Keep us posted if you get to a better result, would be good to know.