of course, Kay is right; I just assumed that the frames were "warped", or not corrected for spatial distortion. Mosflm does require "unwarped" data from the Bruker CCD detectors. I haven't seen images from their CMOS detectors which may not require unwarping (but probably will...).
Harry
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Dr Harry Powell, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge, CB2 0QH
Chairman of International Union of Crystallography Commission on Crystallographic Computing
Chairman of European Crystallographic Association SIG9 (Crystallographic Computing)