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I was thinking of having two focusors at one stage - my new 2" low profile custom made heavy duty crayford and 90degrees around the tube a 2" ultralow profile helical focusor (stands 1" high fully racked in ! that I happen to have in draw and has never been used) to do prime focus stuff , rating the secondary as required.
Wonder if something like that might be a solution for you ?
I have the
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