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Old 10-11-2018, 03:14 PM
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codemonkey (Lee)
Lee "Wormsy" Borsboom

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Join Date: Jul 2013
Location: Kilcoy, QLD
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Quote:
Originally Posted by RickS View Post
With a KAF-16803 and deep wells that will give you a total integration of around 200K or more electrons and pretty good SNR. With a CMOS camera at high gain it might only give you a few thousand e- and poor SNR. It's always a good idea to do the maths:

Total electrons = number of subs x 1/2 full well (assume you're doing flats at around 30K ADU)

SNR = total e- / sqrt(total e-) = sqrt(total e-)

Somewhere around 250K e- is a good number but possibly impractical with shallow wells. It's 6 subs with my U16M and 252 subs with my ASI1600mm at a gain of 200!

Cheers,
Rick.
I have never heard this before. Interesting. I typically get 25 subs per master flat with my gear which gives me only ~ 50k. Perhaps I should set the bar a little higher here.
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