Helios-44

Helios-44 is a Soviet copy of the 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.

Specification
Source:


 * Distance scale: 0.5 m to ∞
 * Aperture: f/2 - f/16
 * Focal Length: 58 mm
 * Mount: M39, M42, Pentax-K, Zenit-D, Canon EF
 * 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 (for Helios-44M-7)