How to convert your Nikon lens into a telescope or a microscope (Nikon lens scope converter) - Nikon Rumors
Kenko Lens2scope Adapter for Canon EF / EF-S Mount K-LS10-CEAB
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How to convert your Nikon lens into a telescope or a microscope (Nikon lens scope converter) - Nikon Rumors
Nikon lens scope converter - Collectcamera
Amazon.com : Astromania Canon EOS-M T2 Mount Lens Adapter for Canon EOS-M Camera System Telescope/Spotting Scope Accessories : Electronics