Industar 26m-U Photo Lens for Soviet Enlargers

I-26m-U 2.8/52 (INDUSTAR-26M-UF/2.8 52 mm) – lens for Soviet magnifying glasses. The lens does not have a focusing ring, which makes it difficult to use as a photographic lens. The I-26m-U 2.8/52 can easily be turned into a macro lens, which is what makes it interesting.

I-26m-U 2.8/52 is a redesign of the Industar-26m 1:2.8 F=5cm P/I-26m 2.8/52 (or similar) lens for use in photographic enlargers.
It differs from the hordes of other similar lenses in the I-50/I-96 series for I-26m-U 2.8/52 enlargers in its body, relative aperture, and 10-blade aperture that closes to a minimum. value F/16.

On Canon cameras you can use a lens with two adapters: M42-Canon EOS + M39-M42.

On Nikon cameras you can use a lens with two adapters: M42-Nikon F + M39-M42.

I-26m-U 2.8/52 does not have a focus ring. It is impossible to focus with this lens in the usual sense of the word. The lens always focuses at a certain distance. It is very convenient to focus by moving the camera towards or away from the subject. It is very convenient to use the I-26m-U 2.8/52 with macro rings of different thicknesses, which allows you to change the focusing distance and magnification factor.