How to set the AF Mode on the EOS 40D

Article ID: ART101989 | Date published: 05/11/2015 | Date last updated: 08/15/2015
 

Description

How to set the AF Mode on the EOS 40D

Solution

Select the AF mode suiting the shooting conditions or subject. In the Basic Zone modes, the optimum AF mode is set automatically.
1 On the lens, set the focus mode switch to <AF>.

2 Set the Mode Dial to a Creative Zone mode.

3 Press the <AF/DRIVE> button.

4 Select the AF mode.

  • While looking at the LCD panel, turn the dial.

ONE-SHOT : One-Shot AF

AI FOCUS : AI Focus AF

AI SERVO : AI Servo AF

One-Shot AF for Still Subjects

Suited for still subjects. When you press the shutter button halfway, the camera will focus only once.

  • When focus is achieved, the AF point which achieved focus will flash in red, and the focus confirmation light <o> in the viewfinder will also light.
  • With evaluative metering, the exposure setting will be set at the same time focus is achieved.
  • While you hold down the shutter button halfway, the focus will be locked. You can then recompose the shot if desired.
  • In the Creative Zone modes, AF is also possible by pressing the <AF-ON> button.

AI Servo AF for Moving Subjects

This AF mode is for moving subjects when the focusing distance keeps changing. While you hold down the shutter button halfway, the subject will be focused continuously.

  • The exposure is set at the moment the picture is taken.
  • In the Creative Zone modes, AF is also possible by pressing the <AF-ON> button.
  • When the AF point selection is automatic, the camera first uses the center AF point to focus. During autofocusing, if the subject moves away from the center AF point, focus tracking continues as long as the subject is covered by another AF point.

AI Focus AF for Automatic Switching of AF Mode

AI Focus AF switches the AF mode from One-Shot AF to AI Servo AF automatically if the still subject starts moving.

  • After the subject is focused in the One-Shot AF mode, if the subject starts moving, the camera will detect the movement and change the AF mode automatically to AI Servo AF.

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