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Zeiss Biotar optical formula

Helios-44 is a Soviet copy of the Carl Zeiss Biotar 58mm ƒ/2 lens produced under the Helios lens brand.[1] The Lens is currently made in Russia for the M42 lens mount.


  • 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


  1. ^ ""Гелиос-44", 2/58, КМЗ, ММЗ, Валдайский з-д "Юпитер"". Archived from the original on |archive-url= requires |archive-date= (help).