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I don't think the contrast is for anything other than your monitor display and any images won't be effected no matter how you twiddle with the contrast.
The reason why I suggest to have a trial and error approach was because all that I read had me believing that to capture HA I needed long exposures ... Being limited to 30 seconds at the time I started using the camera I was not even going to try HA until I had auto guiding running...glad I played around..I use gain settings that I bet folk here would say can't be used.. like I go up to 450 on occassion with HA and regularly capture at 350 in RBG..I bet folk say that is so wrong..but it gets me there...I know what you are saying however..when you figure it out I would love to have you post some guide lines for folk like me who are getting started.
Good luck.
Alex
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