Focal length: 37mm Field of view angle: 60° Frame size: 24×36 mm Number of lenses/groups: 6/5 Working distance - 45.5 mm Relative opening: 1:2.8 Aperture scale limits: 1:2.8–1:16 Number of aperture blades: 10 Aperture adjustment - stepless Preset aperture - yes Near focusing limit - 0.7 m Connections: lens with camera - M42×1 for screw-in bits - M49×0.75 for snap-on attachments - ∅51 mm Mounting location for filters: front Resolution according to specifications (center/edge): 45/23 lines/mm Light transmittance: 0.78 Weight - 185 grams Visually, the lens mechanics work perfectly Made in USSR