I see you are getting the same small halos around the brighter stars like I do with the AP..? This article at Astrodon suggests these are from light refecting off the cover slip and back to the chip but you say the Apogee has no cover slip..? Are you sure?
http://www.astrodon.com/articles_faq...1,355,49#STL11
Mike[/quote]
Hi Mike,
Yeah there are a few there but not really that bright and they don't particularly bother me. I get a few with the Astronomiks as well but really pretty minor. They both seem to perform well in this regard.
I posted the question on the Apogee group to make sure there is no cover slip but I did read that in a post a long time ago when I was evaluating the cameras.
The reflections are almost certainly between the filters and the flatteners.
I would take that Astrodon article with a grain of salt. Sounds to me like somebody using techno talk to hide a weakness.
If you have ever seen an Astrodon filter there would be no question where the reflections come from. They are like mirrors, like Ha filters. I have seen some horrendous reflections far far worse than anything in either of our images from Astrodon Gen 1 and APOs.
Reflections from the cover slip give tiny little reflections hardly worth bothering with but a small gain regardless. After all the slip is only a few mm from the chip. It couldn't physically give a largish reflection. There are posted examples on the net just not sure where now. Perhaps the Apogee site.
As you must use a flattener with these large chipped cameras reflections become a real point to check out.
Gen 11 Astrodons may well be different although I had someone send me an image with them that showed really bad reflections. I forget what APO it was -perhaps an FSQ106ED.
Greg.
