Quote:
Originally Posted by troypiggo
Mind if I ask - Is there a benefit to doing this over Av mode? Why do you need an odd number of flats?
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Hi Troy,
It's been years since I've done any astro photography, I'm pushing the old brain to remember, it's been discussed many times on here though I'm sure.
I use P mode and stick to 100 ISO (giving lower noise, better signal) because it initially gives me a histogram close to what I'm after, 1/3 to 1/2 way across.
If it's not close to that I can switch to manual and tweak the setting I got from the P settings to get the ideal histogram.
I use an odd number because I 'median combine' the flats and the 'math algorithm' used in 'median combine' works better with an odd number of frames, from memory.
RB