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Andy, if you can't see stars brightly enough to put one in the centre of the screen and magnify the star 5 or 10x for focusing with a Bahtinov mask,
either something is wrong with the camera, or you are not using " Live View"
correctly. Precise focusing with Live View and a Bahtinov mask is both
quick and easy. I don't know what experience or knowledge you have.
I'm pretty sure the gain is not adjustable, because it doesn't need to be;
brighter stars are clearly visible.
raymo
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