Soviet lens Bokeh Portrait. Lenses are like new! Relative aperture: 1: 2. Rock of-diafragms: Frome 2 is 16. Focusing rank: Frome 0.5m 20m is the infinity. HELIOS-44m-4 2/58 has a diaphragm preset ring. With it, you can select one of the fixed values: F / 2, 2.8, 4, 5.6, 8, 11, 16. Unlike the preset […]