Jupiter-12 implements the optical design of the Biogon 2.8 / 35 lens by the German company Carl Zeiss.

The design and technological documentation of Zeiss went to the USSR as reparations.

The first issues even went under the name BK-35 - Biogon Krasnogorskiy, 35 mm.

The production of lenses at KMZ began in 1947 on the basis of optical units supplied from Germany. Since 1952, the lens has been equipped with lenses already completely manufactured in Krasnogorsk.

Variants with M39 and Contax-Kiev threads were produced for Zorkiy and Kiev rangefinder cameras, respectively.

Focal length: 35mm

Field of view: 63 °

Frame size: 24 × 36 mm

Number of lenses / groups: 6/4

Working distance - 28.8 mm

Aperture ratio: 1: 2.8

Aperture scale limits: 1: 2.8–1: 22

Aperture blades - 5

Aperture adjustment - stepless

Aperture preset - none

Near focusing limit - 1 m

Connections:

lens with camera - M39 × 1

for screw-in bits - M40.5 × 0.5

for slip-on attachments - ∅51 mm

Filter Mount Location: Front

Resolution according to TU (center / edge): 34/12 lines / mm

Light transmittance: 0.75

Weight - 101 g