William Optics 1.25" 90-deg Erecting Prism Diagonal with Helical Focusing for 50mm CCD guidescope # M-P90
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New from William Optics - 1.25" 90-deg Erecting Prism Diagonal with Helical Focusing # M-P90.
For use only with William Optics' 50mm CCD guidescope to convert guidescope into a right angle correct image finderscope. Diagonal features a helical focusing mechanism in the eyepiece holder with 15mm of focus travel.
The male thread on the finder side is M52x1.0 which is not a common astronomy thread, so the use of this item with other finders is highly unlikely.
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