Reply To: Bias Frames for CMOS

Forums Photometry Bias Frames for CMOS Reply To: Bias Frames for CMOS

Mr Ian David Sharp

Just to clarify
My flats taken with a light pad and T-shirt required exposures of 2.3 sec to get the histogram max
between 1/3 and 1/2 of max ADU count.
That means I need to take a set of darks at the same exposure (all other things as you say replicated, temp gain etc.)

Hi Kevin,

Yes, that’s correct – you need darks to match your flats (and darks to match your lights of course!). My exposures vary from about 2 to 8 seconds with my CCD based system with my LED screen.