This is an Olympus 42mm f1.7 lens from a dead Olympus SP that has been adapted to Sony E mount. It reaches infinity nicely, and uses a real helicoid to focus, which is smooth and gives a good MFD. This isn't an easy lens to adapt for several reasons, and was more work than the Yashica ones I normally do. However it's worth it, this is a really unique and cool lens. Notable for being one of the only fast lenses from early fixed lens rangefinders with 7 elements instead of just 6.

Optics are clean and clear of scratches, fungus, haze and separation. Focus is smooth.