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SCT and Focal reducer

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Yes' date=' you just remove the visual back and scew the reducer in place...

Note for the x0.63 reducer there's a "design" back focus distance of 110mm from the reducer to the ccd or eyepiece.[/quote']

Sorry, I'm being a bit thick here.:icon_scratch:

What exactly is the "visual back"?

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the visual back is the bit on the rear of the scope that the diagonal or eyepiece fits into, it unscrews.

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