Canon EOS 20D Service Manual page 30

7-10 AF precision:
7-11 AF working range:
7-12 AF-assist beam:
8. Exposure Control
8-1 Type:
(4) The focus confirmation beeper can be
enabled or disabled with the menu's [Beep].
(5) The superimposed display can be
enabled/disabled with C.Fn-10.
Same as the EOS 10D
EV -0.5 -18 (at 20ºC and ISO 100, under
Canon's testing standards)
Intermittent firing of built-in flash.
(1) Effective range: Approx. 4 m/13.1 ft. at
center, approx. 3.5 m/11.5 ft. at periphery
(2) Conditions for emission: Emitted
automatically if necessary under low light
(EV 4 or lower at ISO 100).
• Not emitted in the Landscape, Sports, and
Flash OFF modes.
• In a Creative Zone mode, emitted
automatically when the built-in flash has
been popped up manually.
• Emission can be disabled/enabled with
C.Fn-05.
(3) Emission time (1 burst), frequency, times
(stops when the focus confirmation signal
is detected)
Approx. 280 ms or less, approx. 28 Hz,
Max. 8 times
(4) With external EOS Speedlite
The external Speedlite's AF-assist beam is
used.
Note: With AF-assist-equipped EOS Speedlites except
SL580EX, 550EX, 420EX, ST-E2, and 540EZ:
Emitted only during AF point automatic
selection or when the center AF point has been
selected manually. (With a Speedlite other than
the SL580EX, the AF-assist might not be emitted
depending on the AF point selection. Or focus
might not be achieved even if AF-assist is
emitted. If this happens, use the center AF point
to focus.)
Max. aperture TTL metering with 35-zone SPC
with the following selectable modes:
(1) Evaluative metering (linked to all AF points)
(2) Partial metering at center (approx. 9% of
viewfinder)
(3) Centerweighted average metering
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General Information