INDUSTAR 26m 52mm F 2.8

Focal length: 52mm
Mount: M39
Aperture: F 2.8 - F 22
Min focus distance: 1m
Length (from flange): 36/40mm
[+ 11mm for the adapter]
Diameter: 58mm
Weight: 105gr.

Some pictures:

A7 and the lens.

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 85cm 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.