Canon EF 400mm f/2.8L IS II USM Instruction - Page 10

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11. Filters

(sold separately)

A filter can be attached by

screwing it on the front of the

lens.

When a circular polarizing filter

is required, use Canon's

polarizing filter PL-C. The

polarizing filter cannot be

rotated unless the hood is

detached or retracted first.

ENG-9

12. Extenders

Separately-sold Canon

Extenders EF 1.4

II and EF

II can be attached to any of

the four lenses. The extenders

increase the lens' focal length

by 1.4

and 2

respectively,

and the maximum aperture

respectively decreases by 1

stop and 2 stops. The

autofocusing speed also

decreases to maintain proper

AF control.

When Extender EF 1.4

•

EF 2

II is attached to the EF

400 mm f/5.6L USM lens, the

lens switches automatically to

manual focus. Also, when

Extender EF 2

II is attached

to the EF 300 mm f/4L USM

lens, the lens switches

automatically to manual

focus.

II or