LOMO OKS7-28-1 lens 2/28mm, T/2.3, OCT-18 mount for turret Konvas, #840018
This high-quality lens was made in 1984 (#840018) at famous LOMO factory.
The lens is purposed for 35mm film movie cameras like Konvas, Kinor, Arri etc. Covered frame size is 16x22mm. Actual coverage is bit larger, but not enough to cover still image 35mm frame (24x36mm) - there are dark corners. Also, back focus is quite short, so it will not work with reflex cameras like Canon or Zenit. But should be fine for hybrid (mirrorless) cameras.
The lens has so called OCT-18 mount (for turret Konvas cameras), but you may adapt it to other camera.
Max. diameter: 78 mm
Mount diameter: 47 mm
Length: 81 mm
Weight: 290 g
Mechanical condition is fine. Aperture control ring works well (T/2.2-16, click stops). Focus ring is smooth (1m - infinity scale).
Optical condition is acceptable. There are numerous cleaning marks and bubble-like artifacts (coating damage on one of inner surfaces, most probably). Also some damages near glass center that may be either fungus or glue crystallization. These issues may affect image quality, so the lens is advised for amateurs only.
Screw-in lens hood is included. Rear cap is here. Front cap is missing.