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Yeah frame is the key to capturing something out if the changing seeing.
The dirt specs may not be in your optical train but on the sensor itself. I've got a spec on mine but I've not been brave enough to clean it. You can test this by rotating the camera and seeing if the spec rotates with it. You could always use flats to subtract it out.
I don't touch the gamma, as I figure is rather record the raw data and fiddle with it in software later, so the gain is the only thing I change - one thing to be wary of in EZPlanetary is to check the colour balance is more or less right. From memory, when I started using it the green channel was dialled up higher than the red and blue for some reason. Once set it will remember the settings.
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