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the DMk series of cameras would be excellent for the scope (the 21 won't give you full disk coverage though). You don't need a colour camera, and you can still do colour by producing false colour images. Its not difficult.
Alt/Az mount would be fine as long as it tracks accurately, but if you are going that way you might as well get an EQ mount. Non-tracking while possible would be frustrating and your avi would only be of short duration. You should be aiming for at least 500 or 600 exposures preferably more and a non tracking mount would not allow you to do that effectively.
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