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Hello Paul,
Thanks for your input here.
First, the darks were new (less than a few weeks) and I was adaptive subtracting. In my version of CCDStack I don't see anyplace to specify "time scaled" in the calibration setup. If I have a bias frame properly loaded along with a longer dark than the subframe, the calculation appears to proceed automatically. i.e., a 12 min dark is applied 50% to a 6 min sub. At least that is what the calibration info reports upon conclusion of calibration.
I think part of the issue might have been coming from flats that were not working properly due to a reflection. I'm at an impasse in testing further as I await an adapter that will allow me to move the imaging camera closer to the ONAG and still reach focus with the guiding camera. Hopefully this will solve 2 issues; vignetting and the reflection. After that I can see better how those dark things are doing.
Thanks again,
Peter
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