Helios-44

Helios-44 is a Soviet copy of the Carl [Zeiss AG|Carl Zeiss] Biotar 58mm ƒ/2 lens produced under the Helios lens brand. The lens was made in the Soviet Union and Russia, primarily for the M42 lens mount.

Specifications

Source:

Distance scale: 0.5 m to ∞
Aperture: f/2 - f/16
Focal Length: 58 mm
Mount: M39, M42, Pentax-K, Zenit-D
Filter thread: M52 x 0.75 for Helios-44X-X, M49 x 0.75 for other
Weight: 230 g
Resolution: 50/30 lines per millimeter