Focal Length : 800mm
Maximum Aperture : 5.6
Minimum Aperture : 32
Lens Construction : 18 elements in 14 groups
Diagonal Angle of View : 3o 5' (with full-frame sensor camera)
Focus Adjustment : Ring-type Ultrasonic Motor, with inner focus system; mechanical manual focus
Closest Focusing Distance : 19.7 ft./6.0m (maximum close-up magnification: 0.14x)
Filter Size : 52mm (Drop-in Gelatin Filter Holder)
Dimensions (D x L) : 162mm x 461mm (6.4 in. x 18.1 in) (maximum lens length)
Weight : 4,500g (9.9 lbs)

Canon E-180D Lens Cap for EF 400mm f/2.8L IS II USM
Canon Lens Dust Cap E (Rear Lens Cap)
Canon ET-155 (WII) Lens Hood for Select Canon Telephoto Lenses
Canon Lens Case 800
Canon 52mm Drop-in Filter Holder