[Aavso-photometry] Flat frame quality and its effect on photometric accuracy

[George Sjoberg]

Hi Lionel,

Couple of questions about your Flat frame acquisition with the GEM. When you say you take 10 to 25 flats for each filter is that 10 to 25 flats for each side of the meridian? (A total  of 20 to 50 for each filter?) For your masters do you average or median combine (or maybe some other)? What length exposures do you limit yourself to? I've been doing 24 (12 in each orientation) and i'm lucky if I can get two filters done at dusk and two more at dawn. I've become very frustrated at the lack of repeatable positioning of the sbig filter wheel (I'm using the same exact camera as you) Don't have any idea about what to do about the filter wheel.

..george