Quote:
Originally Posted by jsmoraes
It depends from some conditions:
1. the flat was done at the same session of photos ?
2. the flat was done with the same camera position ?
Perhaps the photo had some external influence of light that the flat hasn't. For example: flat doesn't solve problems with light pollution, sky glow and others. Flat only solve problems of sensor response.
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Jorge , i did take the flats the next day and i also took the scope off the mount but took great care not to alter focus or camera position.
Thinking on, as you stated, would sky glow cause this?