LOMO OKS4-28-1 lens 2/28mm, T/2.3, OCT-18 mount for turret Konvas, #732494
This lens was made in 1973 (#732494) 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: 360 g
Mechanical condition is fine. Aperture control ring works well (T/2.3-16, click stops). Focus ring is smooth (1m - infinity scale).
Optical condition is good. There are some cleaning marks. Main issue is an oil spot (about 3mm diameter) in center of the rear element inner surface. Look like extra oil just condensed there due to years of storage in vertical position.
Rear cap is included. Front cap is missing.