Industar 90U 4/75 M39 Enlarging Lens

It is intended for work with photographic enlargers for a projection printing from negatives with a size of shot of 60 x 60 mm.

It is made Lytkarinsky plant of optical glass.
-Focal length: 75 mm
-Blades: 10
-Max. aperture: f/4
-Min. aperture: f/16
-Optical scheme: 4 elements in 3 groups (Tessar type)
-Lens Mount: M39

Note: when installing through the normal adapter M39-Nikon, M39-Canon, M39-Pentax, Industar 90U 4/75 M39 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.