Individual frames look fine, but integrated image is all green

@mfschmitz There are strange bands to the top and bottom of the integrated result that indicate an issue with some of the calibration frames. How does the integration result look when you don’t use flats?

@wvreeven   Here is the integration without any flats.  Just darks and lights.

Thanks,

Mark

@mfschmitz There barely is any difference between the two images, apart from the fact that the upper left and lower right corners suddenly have become purple. What result do you get it you simply integrate the images without any calibration files at all?

@wvreeven  Ah Ha!  That made a difference.  Integration from just the lights attached.

@mfschmitz How did you take the darks? Were they the same exposure time, temperature, gain and offset as the lights? And taken with the same software as the lights?

@wvreeven  It's the darks!  Here is the integrated image using lights, flats and dark flats.  Looks much better.  I guess I'll be making some new darks -- the ones I was using are only a couple of months old.

Thanks for your help. 

Mark

@wvreeven  The old darks were all the same temperature, gain and exposure time.  Not really sure why they made the problem, but I'll take some new ones and see how that goes.