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Chris, I have found with the KAF8300 on fast scopes 5 minutes is the go.
On slower scopes 10 minutes seems fine. Well depth is 25,500 electrons versus say KAI11002 of around 60,000 and KAF16803 of around 100,000.
Over 5 minutes you start getting some overexposed stars and larger FWHM values in general. There can even be a couple of ugly bloated large stars from some sort of spillover. Once the wells are full its saturated and antiblooming kicks in which is not 100% effective.
I have gone with 5 minute subs with my 8300 camera and I like the results better. Others use slower scopes and haven't seen that problem.
They would if they tried 20 minute subs with a few bright stars in the field.
Greg.
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