Canon EF 400 mm f2.8 L IS USM, 17/13
Canon EF 400 mm f2.8 L IS USM. Lens structure (elements/groups): 17/13, Lens viewing angle, diagonal: 6°, Thread diameter: 6.42" (16.3 cm). Filter size: 2.05" (52 mm), Weight: 24.7 oz (700 g). Magnification: 0.15x