I have a 1500mm FL scope and now considering a 5 x for Jupiter and Saturn shots. My 3 x Barlow is fine for venue and moon and managed a reasonable Jupiter recently with my webcam.
I invested in an IR filter although am considering an IR/UV to replace it.
I have found the DSLR is great for full and 3 x moon imaging while CCD is great for close-up moon. It seems to naturally increase magnification based on the size of the CCD.
I think the DMK may have a better exposure control compared to webcams so you may not need moon or double polarising filter for bright objects but as I haven't used these cameras I really don't know. I suppose plug it in and find out.
Other than IR and/or UV your normal RGB filters will be needed for colour.
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