Irix 11mm f/4 . ݡ ɡ Irix .

11mm f/4 Irix ޡ 15 . 126 3.13% ѡ ED .

ɡ 11mm f/4 : Blackstone Firefly. Blackstone (825 ) ɡ .

Firefly . 595 ء ޡ ( 12% ).

Blackstone ɡ . .