Red P Jupiter 12m39 Rangefinger Wide Angle USSR Lens for Zorki Leica
Wide-angle lens with coated optics for rangefinder cameras.
Jupiter-12 incorporates the optical design of the Biogon 2.8/35 lens from the German company Carl Zeiss
The design and technological documentation of Zeiss went to the USSR as reparations.
The first releases even went under the name BK-35 - Biogon Krasnogorsky, 35 mm.
Focal length: 35mm
Field of view angle: 63°
Frame size: 24×36 mm
Number of lenses/groups: 6/4
Working distance - 28.8 mm
Relative opening: 1:2.8
Aperture scale limits: 1:2.8–1:22
Number of aperture blades: 5
Aperture adjustment - stepless
Aperture preset - none
Near focusing limit - 1 m
Connections:
lens with camera - M39×1
for screw-in attachments - M40.5×0.5
for snap-on attachments - ∅51 mm
Mounting location for filters: front
Resolution according to specifications (center/edge): 34/12 lines/mm
Light transmittance: 0.75
Weight - 101 g
Jupiter-12 lens is compact.
The focus ring is at the very end of the lens. It is quite far from the camera body, and is made ribbed. The width of the ring is sufficient and it is convenient to use
The lens is relatively fast. Maximum aperture 2.8.
The aperture control ring is located on the front end of the lens.
The ring itself is very wide and represents almost the entire internal funnel-shaped surface of the front part of the lens. But to rotate the ring, the notch is applied only to its front thin end.