Taking Flats - Problem revealed
This morning i refined my technique for taking flats.
I aimed the scope into the pre dawn sky.
Then (using sharpcap) watched the histogram and the live image.
Varying the exposure time I was able to find the optimum exposure to reveal a lens problem.
Tried cleaning the primary lens and fault is still there.
So I have a field flattener. Maybe the problem is there, or maybe on the camera lens?
Quite interesting.
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