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If you look at the S video cable that comes with the QHY CCD camera's it has a lump (for want of a better word) towards one end. It must be plugged into the DC102 not the camera end. When I got it wrong there was a lot of noise in the subs (similar to Chris's pic).
Marc try taking a short 1 - 2 sec exposure before the long exposure. I have had that line happen a couple of times on bright objects and short exposure between long exposures seems to get rid of it for me.
Cheers
Mark
Last edited by marki; 23-09-2011 at 10:04 PM.
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