Re: [APML] OT: CCD sensitivity [was: first CCD images]

[Chris1011@aol.com]

In a message dated 3/27/2002 5:33:52 AM Pacific Standard Time, philip@astrocruise.com writes:


> Compare images of bright 
> stars between film and CCD images and the problem stands out immediately - 
> there are hundreds of examples


I think the problems are related to the cover glasses used on the detectors. They are rarely properly multi-coated to reduce reflections. Compounding this is the use of filters that are not exactly plane parallel and don't have proper multi-coatings. My own filter wheel has a poorly made green filter that gives me multiple green overlapping images in a Maltese cross pattern. 

Roland Christen