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The Televue flattener/reducer tells you the distance ~55mm. Problem is, unless the scope and flattener match, the degree of correction may not be what is required for your scope. I've not tried it, but varying from the recommended distance might achieve better correction of field curvature. What we need is a "variable spacer" - like a helical focuser?
Unfortunately buying a flattener for a scope (unless their a matched pair) is a bit like Forrest Gump's box of chocolates!
DT
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