[codemonkey (Lee)]

Does the duration of exposures have any impact on the number of dark frames that you should use to generate a master?

For example, right now I'm capturing a series of 40min dark frames, as this is the max exposure time I use (with OIII). Being 40min long, would this have the effect of averaging out the noise to an extent?

I'm not even sure if it'll have any positive impact with the low noise sensor I have, but I need to build a defect map and I figured I't take the time to do some darks while I was at it and I'm not sure what a good number is.