Got my first CCD camera two months ago and of course there hasn't been a clear night since. Finally had a go at first light yesterday with the QSI683wsg and got some RGB frames of IC443. Processed the data today and it looks like there's an odd gradient in the image that I've never seen with DSLR imaging. Have any of you ever had this issue? I would appreciate any help figuring this out. Thanks.
Here's a calibrated image taken with the QSI and TOA130 with flattener. Notice the magenta colored gradient in the center.