Canon EF 400mm f/2.8L IS II USM Instruction - Page 7

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4. AF Stop Button

During autofocus operation, you can press the

AF stop button to temporarily pause autofocus.

If the shutter button is still pressed halfway when

the AF stop button is released, autofocusing will

continue as before.

• With the EOS 630/600, RT, A2/A2E/5, or 10S/10

set to the AI Servo AF mode and continuous

shooting, AF will not resume even after you let

go of the AF stop button. Press the shutter

release button halfway to resume AF.

• With the EOS A2/A2E/5 and 10S/10 set to the

Sports mode, AF will not resume even after you

let go of the AF stop button. Press the shutter

release button halfway to resume AF.

• The AF stop function also works in AI Servo AF

mode.

• By setting the camera's Custom Function, you

can change the AF stop button's function. For

details, see the camera's instruction manual.

5. Infinity Compensation Mark

Infinity compensation mark

Distance index

To compensate for shifting of the infinity focus

point that results from changes in temperature.

The infinity position at normal temperature is the

point at which the vertical line of the L mark is

aligned with the distance indicator on the

For accurate manual focusing on subjects at

infinity distance, look through the viewfinder while

rotating the focusing ring.

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