This is a Canon lens EF200mm 1.8L II USMSee full specification
Lens construction: 12 elements in 10 groups
Diagonal angle of view: 12°
Focus adjustment: inner focusing system with USM
Closest focusing distance: 2.5m / 8.2ft
Filter size: 48mm rear drop-in
The world's fastest 200mm telephoto lens. Three UD-glass elements eliminate secondary spectrum for sharp images at all apertures. The optics have been designed to give excellent background blur. Try it with the maximum aperture's shallow depth of field.