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Gain is your iso, brightness is the shutter speed. The image will be sharper at lower gain but the trade of is shutter speed. With low gain you need to increase the brightness which lowers the shutter speed or frame rate and higher frame rate is needed to capture the still moments of atmospheric turbulence when imaging the moon and planets.
On a very steady night you can get away with low gain and low shutter speed, but it's always going to be trial and error to find the sweet spot on any given night.
Rick
Last edited by doppler; 11-08-2019 at 05:59 PM.
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