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Peter,
let me throw in a bit of unqualified advice here (and more in response to the possibility of the wanted advert paying off).
The Zeiss turrets I have have have all been prisms. OK, in my case the Zeiss scopes have been f11 or so, but the same turrets are touted at the APQ line of scopes as well, and these are f6 - f8.
While not completely disagreeing with the Fringe Lunatic, I do recall the common feeling that the Zeiss stuff was all prism for a reason, that it worked better in the refractors they were producing at the time.
So, if someone offers up a used Zeiss turret, and it has a prism instead of a mirror, grab it. Don't throw it out simply because of the prism.
Gary
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