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