KMZ Helios 44 m39 13 blades 58mm f/2 USSR Portrait SLR Lens
Helios-44 58 mm f/ 2.0 - fast normal lens for 35 mm SLR cameras with M39 mounting thread
Designed based on the Biotar 2/58 lens (Carl Zeiss Jena). The optical design was calculated at GOI in 1951
Focal length: 58mm
Field of view angle: 40° 28′
Frame size: 24×36 mm
Number of lenses/groups: 6/4
Working distance - 45.2 mm
Relative aperture: 1:2
Aperture scale limits: 1:2–1:16
Number of aperture blades: 13
Aperture adjustment - stepless
Preset aperture - yes
Near focusing limit - 0.5 m
Connections:
lens with camera - M39×1
for screw-in bits – M49×0.5
for snap-on attachments - ∅51 mm
Mounting location for filters: front
Resolution according to specifications (center/edge): 35/14 lines/mm
Light transmittance: 0.08
Weight - 225 grams