Helios-44

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.

Zeiss Biotar optical formula

Specification
  • Distance scale: 0.5 m to ∞
  • Aperture: f/2 - f/16
  • Focal Length: 58 mm
  • Mount: M39, M42, Pentax-K, Zenit-D, Canon EF
  • Mount thread for Attachments: M52 x 0.75
  • Weight: 230 g
  • Resolution: 50/30 lines per millimeter
gollark: No.
gollark: |ℝ| = |ℝ²| because a bijection between them exists so there are as many squares as rectangles so all rectangles are squares, QED.
gollark: There are |ℝ| squares, right, and |ℝ²| rectangles?
gollark: Since I don't know measure theory, though, this sounds dubious.
gollark: Actually, this might be answerable with measure theory somehow.

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