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as ponders says, I usually use a barlow/powermate to get the desired image scale.
My 10" f/5 dob is FL1250mm, so using a 5x powermate gives me 6250mm FL @ f/25.
Dpending on the object, I won't be able to go too much larger because of the resolution of the ToUcam (640x480). Even Jupiter at opposition this year is going to be nudging close to the top and bottom of the capture box.
Some others do eyepiece projection, mainly Gary Beal. I've never tried it, though I can see the benefits.
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