Wimberley Arca-compatible lens plates Type:P-50 (6.75"/15cm) w/ two mounting screws with clean optics and good

with clean optics and good function

and it doubles the focal length (at the cost of two stops of light)

While this viewfinder is designed to fit the F2

straight blades

designed for the Voigtlander Ultra Wide Heliar 15mm lenses but suitable for any 15mm (or equivalent)

Wimberley Arca-compatible lens plates Type:P-50 (6.75"/15cm) w/ two mounting screws with clean optics and goodThese Wimberley quick release plates are designed for lenses, though they may also be suitable for camera bodies and other accessories. In good working order, with minor cosmetic wear which does not affect function. Unless otherwise specified, only the plate and camera mounting screws are included. For full dimensions and instructions, see Wimberley's product page. Images are for illustrative purposes only. Actual items may differ.