A standard kit lens from the Fujica ST series of SLR cameras. The ST series of cameras used the M42 lens mount. This lens seems really well made, all metal.
Found this beautiful little lens on an Argus/Cosina STL 1000. As I understand it, Cosina manufactured most of their own lenses, except a few 1.2 and 1.4 lenses made by Tomioka. In test shots, this looks like a great combination of features for a nifty fifty lens. At 1.8, images are sharp in the middle, with a slight glow to the highlights, and going to somewhat soft around the edges (even with an APS-C digital sensor). Stop down to 5.6, and sharpness is great from edge to edge. I would guess this is the standard kit lens for this camera. It’s a winner on digital!
Got this along with a camera kit I bought, just for the camera strap.
This lens is super clean, I’m guessing it was hardly used, and kept in a clean location. It’s not super sharp, nor super contrasty. The colors look good, and the bokeh is interesting. The biggest disadvantage is that the minimum focusing distance is about 11 feet. So you would need a macro extension to get close to anything small.
This lens is from the ST camera series, and has an M42 mount. I’m not sure about coatings on this lens, as the images have low contrast, and lots of flare.