You can connect a camera with a 52mm threaded lens directly to a ZEISS Victory Harpia spotting scope using the Photo Lens Adapter. The adapter attaches a mirrorless or similarly lightweight camera to the scope's eyepiece. This allows you to put the Victory Harpia's high-quality optics to work as a telephoto lens. To avoid vignetting, a focal length of 30mm for cameras with APS-C sensors and 40mm for full-frame cameras is recommended.
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Excellent product. Digiscoping made easier.
Well machined adapter that fits perfect on the Zeiss eyepiece and has precise filter threads. I experimented with several lens/camera combinations and the Canon “pancake” lenses seemed to provide the best field of view without vignetting. The closer the diameter of the front element to the width of the eyepiece lens the better the result. The EF 40mm/2.8 STM on the full frame, the EF-S 24mm/2.8 STM on the APS-C, and the EF-M 22mm/2 STM on the M series (but the Macro 28mm/3.5 IS STM also worked well). I prefer the Canon M6 because of the focus peaking feature to optimize focus, and the lightest weight configuration. The Zeiss adapters come in only three sizes so you will need a filter ring adapter to match your lens.