Canon C12-8453, Service Manual

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(7) AF-assist light
Like the EOS 300/Rebel 2000/EOS
Kiss III, the EOS ELAN 7 E / EOS 30
uses the built-in flash to fire an
intermittent flash burst as the
AF-assist light. When necessary, the
AF-assist light is emitted
automatically in all the
picture-taking modes except in the
Landscape and Sports modes. In the
Creative Zone modes, you must
manually pop-up the built-in flash
beforehand. The AF-assist light is
emitted when the ambient light is
lower than EV 4. The AF-assist light's firing frequency is 28 Hz and the firing time is
280 ms per burst. The AF-assist light's coverage is good for lenses as short as
28mm. The effective range is about 4.5 meters at the center and about 4 meters
along the periphery.
Also, if an EOS-dedicated Speedlite is attached to the camera, the AF-assist light will
come from the external Speedlite instead. Table 2-3 shows how the AF-assist light
works with external, EOS-dedicated Speedlites.
In response to customer demand, C.Fn-7 (AF-assist light emission/Speedlite's main
flash firing) has been added. When it is not desirable to emit the AF-assist light or to
fire the Speedlite (where flash photography is prohibited), this Custom Function
enables you to prevent the AF-assist light and the built-in flash or external Speedlite
from firing.
(8) In-focus beeper enabled/disabled
As with the EOS 300/Rebel 2000/EOS Kiss III, the beeper can be enabled or
disabled with a Custom Function. If it is disabled, the beeper will not sound even
during self-timer and remote control operations.
Part 2: Technical Information
2-7
Table 2-3 External Speedlite and AF Assist
Camera
420EX
220EX
380EX
550EX
ST-E2
430EZ
540EZ
Automatic Manual Selection
Selection Center Top/Bottom Left/Right
⁄ ⁄ ⁄ ⁄ ⁄
⁄
*
⁄
× × ×
⁄
*
⁄
× × ×
⁄ ⁄
×
⁄ ⁄
⁄ ⁄
×
⁄ ⁄
⁄
*
⁄
× × ×
⁄ ⁄
×
⁄ ⁄
Extreme
Left/Right
* Focuses on the center focusing point only.