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Just getting into the hobby. I attempted M42 last night (manual tracking) and when reviewing the lights I'm wondering if my ISO was set too high (6400) due to the shade of the background. Also notice that in post-processing I'm not obtaining any real good color through stretching. Is my line of thinking correct? Decrease ISO? I also intend to change from a 2 second exposure to a 1 second exposure. Had a lot of trailing.