Pentax Refconverter M  type_Lens The Wein MRB400 is a

The Wein MRB400 is a 1

The Panasonic G Vario 100-300mm f4-5

8 aperture and an (unexpected

Sliders move smoothly and lock securely

Pentax Refconverter M &nbsptype_Lens The Wein MRB400 is aThe Pentax Refconverter M sounds like it does something really fancy, but it's a pretty standard 90 degree magnifying viewfinder. That's good, though! These are useful tools for macro or copystand work, with switchable 1x or 2x magnification. This Refconverter is designed to mount to Pentax M series cameras, which includes the ME MX (and many digital SLRs.) It won't fit the K1000. Spotmatic, or their derivatives. In excellent condition, with case and