This is an old lens from Nitto Kogaku, the MEPRO KOMINAR 55mm f/2.8. It was sold as a set with the KMZ camera, the Meproz Zenith. It has a preset aperture. Dust and debris are usually visible upon inspection. Haze is also characteristic of this lens. You can take photos that make the most of the unique characteristics of an old lens. Also, the body is very light and compact, making it easy to use even for those new to old lenses. The aperture blades and helicoid operate normally. M42 mount. Not a Nikon F mount. Focal length: 55mm Maximum aperture: 2.8 Other features: Old lens