Industar-23U
lens for enlarger, #7001
110 mm, 1:4.5, M39 mount,
Lytkarinsky Plant of Optical Glass (LZOS), Lytkarino, USSR

Very good condition. Lens is clear, does not have any scratches or fungus. Inside there are microspecks of microdust. Body has small signs of age. Aperture ring has a backlash.

This is the lens for medium-format enlarger with frame size 6x9 cm. Production started in 1955.
There are known lenses with more than 6 aperture blades and with limit of aperturing 1/32.

Price in 1985 was 11 Soviet roubles (with average salary 120 Soviet roubles per month).

Note that lens is for enlarger so it does not have focusing ring. Focusing is achieved with moving of the enlarger body. If you want to use it on camera you need macro rings or extension bellows.

Characteristics:
Lens s/number - 7001
Number of lenses - 4 lenses in three groups, Tessar
Angle of view - 52o
Number of aperture blades - 6
Limit of aperturing - 1:4.5 (max), 1:16 (min)
Resolving power - (centre/edge) 50/13 lines/mm
Minimal distance of focusing - unknown
Type of thread - M39
Type of filter thread - filter setting is impossible
Dimensions (mm): 40*58*58
Focal distance - 110 mm.
Mass - 104 g

Industar-23U
lens for enlarger, #7001
110 mm, 1:4.5, M39 mount,
Lytkarinsky Plant of Optical Glass (LZOS), Lytkarino, USSR

Very good condition. Lens is clear, does not have any scratches or fungus. Inside there are microspecks of microdust. Body has small signs of age. Aperture ring has a backlash.

This is the lens for medium-format enlarger with frame size 6x9 cm. Production started in 1955.
There are known lenses with more than 6 aperture blades and with limit of aperturing 1/32.

Price in 1985 was 11 Soviet roubles (with average salary 120 Soviet roubles per month).

Note that lens is for enlarger so it does not have focusing ring. Focusing is achieved with moving of the enlarger body. If you want to use it on camera you need macro rings or extension bellows.