The Canon 400mm 5.6 Features

Focal length and maximum aperture: 400 mm f5.6
Lens construction: 7 elements in 6 groups
Diagonal angle of view: 6°-10°
Focus adjustment: Inner focusing system with USM
Closest focusing distance: 3.5m / 11.5ft
Filter size: 77mm

The Canon 400mm 5.6 includes:
Front and rear cap and User guide

The Canon 400mm Lens Review

- Image quality and build quality are superb. The lens is made of metal, not plastic, which is a huge plus.- Anonymous

- Image quality is excellent, it also takes a 1.4x teleconverter well even though auto focus is lost. The weigh of the lens is good and at a push I can get decent images handholding or on a monopod. - Brian, Staffordshire