When running ACP #Subframe directives, I get serious banding in my AC4040M FITS images. The banding immediately goes away when I remove the #Subframe directive to get full-frame images. I've tried #Subframe 0.95 (to remove 102 pixels from each edge) and #Subframe 0.9375 (to remove a nice 128 pixels). MaxIm 6.30 reports the correct subframe offset and dimensions, but it yields banded images every time. Using or not using the overscan region makes no difference. I need to subframe images from this camera. How do I do that?
I have uploaded 3 example files. They may be downloaded directly from ericdose.com/SBIG/ MP_2356-0001-GG495.fts : ACP Subframe 0.95, severe banding, useless for photometry. MP_2356-0002-GG495.fts : ACP Subframe 0.9375, some banding, doubtful for photometry. MP_2356-0003-GG495.fts : No ACP Subframe (full frame 4112 x 4096), no banding visible, suitable for photometry. Many more images if you need them--I lost 93 of 127 images last night from this problem.
Please confirm by running the DL Config Utility that you are running DL Imaging driver 2.7.1.0 and Firmware Revision 14.
