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There's no doubt that separate RGB filtered imaging will give the best results - that's just physics and optics, but there is something to be said for the ease-of-use in a colour camera if you're in a hurry.
BUT - after you've finished imaging, the final result has to last you for the rest of your life... personally I don't think the extra time for 3 imaging runs in RGB is such a big penalty when you think about that...
Also, if you want to make really spectacular deepsky images then it's normal to use something like a Ha filter instead of a normal red, and the colour cameras will not be able to do that at all.
Mono cameras are also cheaper and simpler to use, and it's easy to upgrade the filters at a later stage without having to throw the whole camera away...
Bird
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