Focal length: 53mm, 55mm Aperture: 1:2.8 Frame size: 24x36mm Number of lenses/groups: 4/3 Aperture scale limits: 1:2.8–1:16 Number of aperture blades: 6 Light diameter first surface: ∅18.6 mm Light diameter of the last surface: ∅16.4 mm Close focus limit: 1 m
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