Nikon Micro-NIKKOR-P.C. Auto 55mm f/3.5 MODIFIED - EF Mount.

Made in Japan.

Appears to have been modified to work with Canon EF Mount cameras with a Beschoi Nik - EOS adapter ring. Used to be a non-Ai Nikon F Mount.

Tested with a Viltrox M43 - EF speed booster on my GH4, and works properly, but f-stop cannot be adjusted while connected - only while detached. I don’t have a native EF Mount camera to test this on - so just take note of this before buying.

I’m also not enough of a camera/film nerd to know what the crop factor/conversion ratio would be for this setup, so your guess is as good as mine.

Decent condition for it being vintage. Minimal wear and tear. Glass has a few specs of dust but no fungus or clouding. Focus is pretty smooth. There’s a little bit of wear around the outer metal edge of the front of the lens and on the connector (shown in pics)