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You should probably read my article in JAAVSO on "The M67 Experiment", where I showed how various unfiltered CCD cameras compared with the standard system. An on-line copy of that article is at http://ftp.nofs.navy.mil/pub/outgoing/m67/ Brian Skiff is correct in that most unfiltered systems, especially the older chips like the TC255, are R-like and you should use Rc magnitudes for your reports (and mark the magnitudes as CR). However, you can follow the steps in the paper and determine this for yourself. Arne HG LINDBERG wrote: > > If I now doing some measurement on binary stars with this camera, what do I > call the magnitude? QC or what. >
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