MINT MMZ! Helios 44-2 f/2 58mm Belomo Lens M42 Mount #8461754 Original Set!
HELIOS"-44-2 2/58 it has a pre-installed diaphragm ring. It allows you to select one of the fixed values: F / 2, 2.8, 4, 5.6, 8, 11, 16. The diaphragm consists of 8 blades that form holes in the form of regular polyhedra.