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Last night in Heathcote I was taking 300s exposures at ISO400 because I know that is long enough to sufficiently swamp the read noise but not so long as to saturate anything but the brightest of things (M42 core).
If Melbourne though I’d be limiting myself to 30s exposures because of light pollution and ISO100.
It is basically a balance between long enough to move the bottom of the histogram far enough to the right but short enough to not burn out the stars.
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