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Thanks for the advice:
Alex, I use a Sigma clip so mybe the threshold is too low. Will try a median for the heck of it. I try not to push the saturation beyond +25 but by the time I finish with curves the actual gain my be higher. Thanks
Hi Doug, The DSI II is not cooled and that may well be the problem with the gradient. Re noise I suppose what i really need to do is to go out and get a guider and take longer exposures. Thanks for your input.
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