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Cheers mate :-)
I've got a fair amount of hot/warm pixels in my camera so I was mostly just building up a master dark that I could use to generate a good defect map. Probably didn't need to match exposure length for this purpose, but I figured since I had the camera down I might as well..
I ended up doing 11x40min darks. I ran a quick test against some data I've recently acquired:
1 set of broadband data, 20x420s
1 set of narrowband data 9x1800s
The broadband data showed a measurable and visually apparent increase in noise.
The narrowband data showed a measurable and visually apparent decrease in noise.
Based on this, in future I'll be using darks on those long narrowband subs but I'll just use my defect map on the shorter subs.
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