The Tair-11A 135 mm f/ 2.8 (Russian: "Таир") is a fast telephoto lens.
Export model - Tair-11A. It was produced at the KMZ, Krasnogorsk (the Krasnogorsk Mechanical Plant).
This is a fast coated lens. It is equipped with an iris preset aperture. The lens is equipped with a small built-in hood.
Its 20-blade aperture is nearly ideally round, which provides a beautiful out-of-focus blur when wide open. The lens is sharp and, at the same time, plastic.
As compared to 11 and 11-2 modifications, its resolution at the center and on the edges is much higher. Besides, the 11A modification features a more convenient (and more up-to-date) build. Its minimum focusing distance is 30 cm shorter and makes 1.2 m. It is shorter than his "relatives", but a bit heavier.
Modifications with the M42 screw mount are more common, though sometimes you can come across an M39 variant.
The A in the lens name means that the adapter can be attached to the lens - interchangeable KP-A/N mount (Rus. КП-А/Н), which makes it possible to use the Tair-11A on cameras with the N (Nikon F) bayonet mount, on Nikon cameras, and on the Zenit-11 camera.
Resolution according to the technical specifications (center/edge): 44/24 lpmm
Via adapters the 11A 135mm f/2.8 can be easily mounted on modern digital SLR cameras.
The model year of a Soviet lens can always be determined by the first two figures of its serial number.
Links to online resources:
Posted by: Sergei Borodin Date of publication: 04.08.2010