55mm · f/2.8
The Industar-61 L/D 55mm f/2.8 is a Soviet rangefinder lens known for its sharpness and contrast, especially wide-open, with nice bokeh. Optically, it holds its own but is not a Leica killer; it shows some vignetting and barrel distortion. Build quality is cheap, with lightweight aluminum and inaccurate focusing. It suits budget-conscious photographers seeking good optics on M39/M42 cameras, including Leicas with an adapter.