Description
Focal Length & Maximum Aperture: 200-400mm 1:4 with extender off, 280-560mm 1:5.6 with extender on
Lens Construction: 25 elements in 20 groups (incl 1 rear filter) with extender off, 33 elements in 24 groups (incl 1 rear filter) with extender on
Diagonal Angle of View: 12°-6°10′ with extender off, 8°50′-4°25′ with extender on
