Industar-23U enlarging lens

Industar-23U enlarging lens - 4 anastigmat lens designed for negative up to 6,5x9 cm. Focusing is done by rotating the lens focusing ring with rim enlarger.

Industar-23U specification:

Aperture range - 4,5-16.

Resolution, referred to the plane of the negative at 5 * magnification: center/edge lines/mm - 50/13.

Field of view - 52 °.

Operating distance - 95.45 mm.

Relative aperture of 1: 4.5

Dimensions Ø52 × 45 ("U")

Blades: 6
Optical scheme: Tessar type
Lens Mount: M39

Note: when installing through the normal adapter M39-Nikon, M39-Canon, M39-Pentax, Industar-23U hurt mirror cameras, as it has a huge overhang the rear of the helix. The rear of the heavily favored. The lens can be used on a narrow format (on conventional crop cameras and modern full-frame SLR cameras) only with the macro tubes or macro fold bellows.