Industar 50mm f/3.5 for L39 mount. Since there is no L39 category in the mount category, it is temporarily listed in the αE mount category. I think it's a famous pancake lens that performs well from the open aperture. The 7th photo is at f/3.5 (open), and the 8th photo is at f/16. Taken with a Nikon Zf. I've also included photos showing the size when mounted on a rangefinder Fed-2. I used it with a digital SLR camera by converting it to an M42 mount and using a mount adapter. The lens is clean with no scratches, haze, or mold. The helicoid grease has been replaced, and the focus ring moves smoothly with a moderate torque. A genuine metal lens cap is also included. Focal length: 19-70mm Aperture: f/2.9-4 Other features: All-lens Other features: Old lens, with front lens cap Other features: Old lens, with front lens cap, with rear lens cap