50mm · f/1.7
The Zenitar-M 50 mm f/1.7 is a manual-focus lens with solid center sharpness wide open, but corners are soft until stopped down (OpticalLimits). Chromatic aberration and flare can be issues. Build quality is all-metal, compact, and smooth-focusing, though the aperture ring is unmarked and stiff. It suits budget-conscious shooters wanting a fast normal lens for manual-focus cameras, but not for critical edge-to-edge sharpness or flare resistance.