ФС-2 300mm f/4.5 (Таир-2)

FS-2 / PhS-2 (Tair-2)

http://lens-club.ru/lenses/item/c_4281.html

https://radojuva.com/2016/07/fs-2-300mm-f4-5/

http://www.zenitcamera.com/archive/fs/index.html