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Hi Suavi,
I don't think it's worth trying for small image scales with a refractor. Unless you have a fairly exotic (i.e. expensive) design you won't be getting diffraction limited performance over more than a small area at the centre of the field. Even then, coupled with a small pixel size camera the combination will be slow. Might as well bite the bullet and go for a larger Newt or CDK if that's what you want.
Cheers,
Rick.
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