Thread: 10 or 5?
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Old 25-07-2018, 09:50 PM
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luka is offline
Join Date: Apr 2007
Location: Perth, Australia
Posts: 1,117
Amongst other factors the optimum exposure time will depend on the amount of light pollution. Your optimum (sky-limited) exposure will not be the same as for someone else. My camera has a similar read noise like yours and 3min is the optimum sky limited exposure for my location (<5km from Perth CBD).

If you expose for longer than sky-limited you will not improve the SNR but you will lose dynamic range. You should not be guessing, the optimum exposure is relatively easy to calculate, see this great IIS thread by Ray.

There is also a PI script called CalculateSkyLimitedExposure (or something similar).
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