Sigma USB Dock for Nikon F mount lenses  type_Black & White An original eye level prism

An original eye level prism viewfinder for the Pentacon Six medium format camera

there's no rangefinder coupling

forget the name and get this tripod

The Sawyer's Pana-Vue 3 is a classic folding viewer for 35mm slides

this should do the trick- but check your manual to be sure

Sigma USB Dock for Nikon F mount lenses &nbsptype_Black & White An original eye level prismThe Sigma USB dock is a peripheral that allows the user to perform firmware updates on compatible Sigma lenses, and if that's not handy enough, it lets you fine tune certain focus settings to better match your lens and camera. This dock is designed for Nikon F mount lenses. Please note: this dock only works with compatible Sigma lenses. It does not work with all of them! If you have other brands of lenses, this dock won't work on them, either. It is