Hi Simon,
I don't know the ins and outs of your camera but providing you have it set at its maximum resolution in Sharpcap then you probably have the maximum field of view for your setup.
Ways to get a larger field of view - shorter focal length telescope or larger sensor. With a C9.25 I wouldn't expect you'd be able to get the whole moon in one frame with most astro cameras. Maybe with a full frame sensor (like in a full-frame DSLR) you might just manage it?
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