The 50mm Astromania finder features great optics and the potential ability to use the finder as a telephoto lens and use the finder in a straight through mode, 45 degree prism mode, or 90 degree prism mode. You can loosen a set screw to adjust the draw tube that holds the eyepiece or prism diagonal. You get a wide range of focus options, but it will not work for all prism/eyepiece combinations. Also, because of the sliding draw tube, you don't have an internal baffle. When sighting on an object near the moon, you will get a lot of annoying stray light. It's a well made accessory with the caveats mentioned.
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