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I too often think that collecting RGB data would be far easier using a cooled colour CCD, but, like Mike stated, the thought of giving up the resolution inhibits the move to do so.
However, perhaps old school a bit, many used to (and probably still do) bin 2x2 for RGB but combine this with unbinned luminance. So what about using two cameras? One camera does luminance at full resolution and camera #2 does RGB in one go. Would that not save a lot of time (but not money!) and perhaps give the best of both options?
As far as doing LRGB, LRGB, etc. It's a fine idea as long as the filters are really parfocal. Mine are not good enough to get away without a zillion focus routines. It's probably my refractor optics rather than the filters so this option might work fine on a newtonian perhaps.
Peter
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