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Flash with Other Modes
The TTL autoflash control sys¬
tem can be used with Type B
cameras set to the P (Program
AE),
Av
(Aperture-priority AE),
Tv
(Shutter speed-priority AE),
or
M
(Manual) mode.
■ When you press the shutter button
halfway, the shutter speed and
aperture settings are displayed in
the viewfinder as in any AE mode
Mode
Shutter Speed
Flash Aperture
P
Automatically set (1/60 sec. to 1/X sec.)"
Automatically set
Av
Automatically set (30 sec. to 1/X sec )
Manually set
Tv
Manually set (30 sec. to 1/X sec,)
Automatically set
M
Manually set (buLb to 1/X sec.)
Manually set
•Manually set refers to the setting by the user Automatically set refers to the set¬
ting computed by the Speedlite 220EX and camera
• 1/X sec. refers to the camera maximum sync speed (see page 40)
* 1/90 sec only for the EOS 500, EOS REBEL X, and EOS REBEL XS cameras.
■ The Speedlite 220EX fires when the shutter button is pressed completely. The
flash output is regulated by the TTL autoflash control system according to the
aperture setting for optimum flash exposure The flash output is metered off-
the-film and cut off automatically when the correct flash exposure is obtained.
Since only the light which actually reaches the film is measured, light loss
caused by lens attachments such as teleconverters or filters is automatically
taken into consideration Even zoom lenses that change their effective aperture
when zoomed to different focal lengths {variable aperture zooms) do not pre¬
sent a problem with TTL flash measurement
■ The exposure for the background is determined with the shutter speed and
aperture settings
• Use of the FP flash button is not applicable for flash photography with
Type B cameras.
• If the flash is used in the
DEP
(Depth-of-field AE) mode or the
Programmed Image Control modes, it will be similar to using flash in
the
P
mode
29
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