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Old 06-11-2011, 07:48 AM
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peeb61 (Paul)
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Join Date: Jan 2007
Location: Wollongong
Posts: 716
Help with coma? - UPDATED.

Hi All,
I was wondering if anyone could give me good advice on how to fix this problem.

Up until now, I have had good success using my QHY8L with my current set up which is...

Bintel f/4 200mm Newt, QHY8L with Baader Coma Corrector with I assume, the correct spacing from chip to the back of the CC of 56mm and an Orion Deep Sky Filter on the end to curb light pollution in my area.

Just recently the images taken are showing Coma? on the edge of field, see attached. (This is a 1 minute exposure at -15 taken last night.) I mean would this be coma or bad collimation? The scope was collimated a while back with the Cats Eye and I will get it checked again as soon as possible.

The cropped image is taken from the bottom left hand corner.

Many thanks for looking.

Paul
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Last edited by peeb61; 19-11-2011 at 05:41 PM. Reason: update with a cropped image
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