INDUSTAR-26M 1:2.8 F=5cm

Focal length: 50mm
Mount: Contax rf
Aperture: F 2.8 - F 22
Min focus distance: 0.90m
Length (see*): 27mm [+ 19/25mm for the adapter]

Diameter: 48mm
Weight: 90gr.

*Contax mount is quite different. In fact it's two mounts. The inner mount has a focussing helical, so the standard lenses don't have one. The outer mount is for other lenses which have their own focussing device. Its difficult to measure. I have taken the locking pin for reference.

Some pictures:

A7 and the lens.

The grip is a HorusBennu leather grip attached to a Manfrotto 200PL style quick release plate, a special plate made by HorusBennu for their grips. It allows you to use the camera, with the grip attached, on a Manfrotto RC2 Rapid Connect Adapter.

Sample pictures: You may click on the sample image (except closest focus) for full resolution. The full resolution image opens in a new window, so you can keep it open for comparison. Focus is on the satellite dish to the right of the big solar panel near the center of the photo.

F 2.8.

F 8.

F 22.

Closest focus  is 80cm from outermost edge of the lens, F 8. Focus on the program wheel of the camera.

Although this is an older lens which can be found for very cheap, it's decent. Wide open it's soft at the corners, but stopped down it's sharp.
The lens has no close focussing capablities. It is very relatively small and lightweight.

The Contax rf mount adapter is difficult to find and sometimes expensive, but Contax mount lenses are often much cheaper than their M39 versions. This lens was a gift which came with the adapter from a friendly Russian seller.