Canon EOS 20D Service Manual page 37

General Information
11. Built-in Flash
11-1 Type:
11-2 Guide No.:
11-3 Recycling time:
11-4 Flash-ready indicator:
11-5 Flash coverage:
11-6 Flash button:
11-7 Firing conditions:
11-8 Flash sync speed:
11-9 Flash aperture:
11-10 Autoflash system:
11-11 Flash level control:
Auto pop-up, retractable, built-in flash in the
pentaprism
Guide No. 13 (at ISO 100 in meters)
Approx. 3 sec.
Flash-ready indicator lights on in viewfinder
• When the flash recycles, the flash icon and
"buSy" are displayed and the shutter
release locks.
Up to 17mm focal length (equivalent to 27mm in
135 format)
In Creative Zone modes, the button pops up the
flash.
1) Creative Zone modes: After pop-up, fires at all
times.
2) Basic Zone modes (except Landscape, Sports,
Flash off):
Auto pop-up and firing under low-light and
backlit conditions.
Max. X-sync speed 1/250 sec.
(1) In Full Auto, Program, A-DEP, Portrait, and
Close-up modes: Set automatically to
1/250 sec. to 1/60 sec.
(2) In the Night Portrait mode: Set
automatically to 1/250 sec. to 2 sec.
(3) In Tv and M modes: Set manually to 1/250
sec. or slower.
(4) In Av mode: Set automatically to 1/250
sec. to 30 sec. depending on the aperture
setting.
The flash aperture is set as shown below
Shooting Mode Av-set
1) Program AE
2) Shutter-priority AE
3) Aperture-priority AE Yes
4) Depth-of-field AE
5) Full Auto
6) Portrait
7) Close-up
8) Night Portrait
9) Manual
Yes
* In the Landscape, Sports, and Flash OFF modes, the built-in flash will
not fire. With an external Speedlite, it will fire in the Landscape and
Sports modes (same result as 1).
E-TTL II autoflash
Automatic flash output reduction for backlit
conditions and daylight flash.
32
Av-Auto
Remarks
E-TTL P Tv-AE
Yes
Yes
Yes
Yes The result is the
same as 1)
Yes
Yes
f/2.8 restriction for
Yes
max. aperture.