Doug about your question, I think, now heed this, I think, you are suppose to take more dark frames than light ones, so if you took 10 lights than at least fifteen to twenty darks would be the go.
It is also the rule by many on IIS that a batch of 16 flats be recorded before the session, and the lot calibrated and stuff in Image Plus, or similar program.
I was just wondering about the effectiveness of a dark if it wasn't the same, or nearly the same temp as the light.
because i need that time for imaging real data
Leon
