Like Den The Man, I too assumed the eyepiece would have to be a "certain" size, to fit internally.
I have and use occasionally, a similar sort of eyepiece projection unit for the Zeiss, and the Zeiss orthos fit inside, just. You would want to ensure that the adaptor actually fitted the eyepieces you have, or intend, and I seriously doubt the Naglers would fit.
Same place for this accessory as where the scope came from?
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