Quote:
Originally Posted by rcheshire
Paul. I guess you have tried different flat illumination.
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I more or less fiddled around with exposure time until dust bunnies and the expected vignetting was visible on an unstretched image but no part of the image was saturated.
I guess the next thing to try would be to fiddle around with different exposure times and try a single light, single flat image with each of the flat times to see if any work better. If one seems to be working well I should hopefully be able to work out by examining the flat what sort of peak and average/mean ADU works.
I can agree with the post above, using a single setting the results seem to change rapidly image to image when using the sky. I guess I should build a light box, but for a 9.25 inch SCT that won’t be particularly cheap. If I do I should size it for a possible future 10 inch newt.