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The C-8 is the same aperture as your Dob, but assuming that your Dob
has a focal length of around 1000mm [f/5], and assuming that the C-8
was used without a focal reducer, the C-8's 2030mm [f/10] focal length will produce an image twice the size. As the image is twice the size to
start with, it can also be cropped more to produce a larger good quality
image.
raymo
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