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Hi Paul,
Assuming your webcam chip is 3.6mm x 2.7mm (640 x 480 @ 5.6um), the the captured FOV without a focal reducer on your 10" SCT F/10 would be pretty small ... only 4.9 x 3.7 arcmin.
To capture the whole moon (about 30 arcmin) in a single go, you would need to get your "effective" focal length down by a factor of 8.1 to about 308mm.
Cheers,
Jeff
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