Distance scale: 0.5 m to ∞
Aperture: f/2 - f/16
Focal Length: 58 mm
Mount: M42, Pentax-K, Zenit-D
Mount thread for Attachments: M52 x 0.75
Weight: 230 g
Resolution: 50/30 lines per millimeter
Helios-44 is a Soviet copy of the Carl Zeiss Biotar 58mm ƒ/2 lens produced under the Helios lens brand. The Lens is currently made in Russia for the M42 lens mount.