Af-assist beam, Automatic reversion to defauit settings – Canon 550EX User Manual
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12. AF-Assist Beam
In low-light or low-contrast situations, the
Speedlite emits the AF-assist beam
automatically to assist autofocusing. The
AF-assist beam is compatible with the
EOS-3’s area AF and EOS-1 N’s five
focusing points. The AF-assist beam is
effective with 28mm and longer lenses.
Its effective range in darkness is
indicated in the table below. See page
123 for details on when the AF-assist
beam is emitted.
Position
Effective Range
Center
Approx 0 6 -10 m / 2 - 33 ft
Periphery
Approx, 0.6 - 5 m / 2 -16 4 ft.
Automatic Reversion to Defauit Settings
When Speedlite 550EX is attached to the
EOS-3, EOS-1N, or EOS-1, the
Speedlite’s settings can be reset to its
default settings (except for the Custom
Functions) by pressing the camera’s
<CLEAR> button. The default settings
are as follows.
As a Normal
Speedlite
E-TTL autoflash*
(All related settings are canceled )
Auto zoom
As a
Wireless
Master
Unit
E-TTL autoflash*
(All related settings are canceled.)
d ^Mmm
Master flash ON
No flash ratio setting
' With the EOS-1N and EOS-1, TTL autoflash takes
effect.
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