Would be appreciated to know more about this uncommon lens for spy camera. Visually looks like standard 2.8/28, but with different characteristics indeed. Thanks in advance and HAPPY NEW YEAR!

http://www.ussrphoto.com/UserContent/31122009_DSC04442rsz.jpg

http://www.ussrphoto.com/UserContent/31122009_DSC04438rsz.jpg
Best Regards,
Aidas