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Old 24-03-2008, 09:13 AM
Zuts
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Join Date: Mar 2007
Location: sydney
Posts: 1,830
Help, How accurate should flats be?

Hi Guys,

I am thinking of taking some flats.

(1) When I attach my camera I place it by eye, roughly at 90 degrees to the line the focuser makes, i.e straight up and down. As I havnt marked the exact position it is probably a few mm different each time.

(2) If I take them when I am not completely focussed, ie at the start of my imaging run I can only get a rough focus because I know roughly where the focus is.

Given the above would flats like these still be useful, would DSS map them somehow or is there some other may of doing the mapping?

Thanks Paul
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