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Hi Mike,
It's a tough choice really. If you buy one of the nice mono firewire cams it's a pretty large investment, then add on filters and a wheel of some sort. Or you could do what I just did, use the toucam for the colour and the mono for the luminance. Seems to work pretty well.
Now I have a mono SBig and CFW for deep sky stuff, and you quickly learn that all the detail is in the luminance channel. Many astroimagers bin their colour subs 2x2 with no drop in image quality. So why not for planetary? The SPC900NC Toucam uses the same chip as the DMK21AF04, with a bayer matrix over the top, so image scale is the same as well.
Good luck.
Stuart
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