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EF400mm f/5.6L USM Other professional features are: a built-in lens hood with locking mechanism, dual manual focusing rings, a removable ring-type tripod mount, full-time manual focusing, and focus range selector for 3.5m to infinity or 8.5m to infinity. Extenders EF 1.4 X and EF 2X can be used with manual focusing.

Using Extenders (Sold Separately) with the EF 400mm f/5.6L USM lens

Extenders With Extender EF 1.4 x II attached to the lens, only manual focus is possible. When shooting with EOS A2/A2E/5, use -0.5 step exposure compensation when using extender EF1.4x II, and use -1 step exposure when using extender EF2x II.

Using Extension Tubes (Sold Separately) with the EF 400mm f/5.6L USM lens

You can attach extension tube EF12 II or EF25 II for magnified shots. The shooting distance and magnification are shown below. Camera-to-Subject Distance ( mm ) Magnification Near Far Near Far EF 12 II 2893 13449 0.16x 0.03x EF 25 II 2460 6610 0.21x 0.07x

EF 400mm f/5.6L USM Angle of View

EF 400mm f/5.6L USM Angle of View 6°10" Source: Canon USA EF Lens Page - Lens Chart