Quote:
Originally Posted by multiweb
All the inverse vignetting and the bright corners is caused by noise. The SNR is higher in your central field so when you calibrate the frame you bring up all the edge noise. Simple fix get more data and it'll go away.
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Thanks Marc. That's definitely a possibility.
I'll use a Dew shield, take fresh flats and take more subs next time I'm out.
It's surprising though as I have my gain set to 90 and they're 2 minute subs.