Canon Speedlite 550EX Instructions Manual page 22

12. AF-Assist Beam
...
,;
non
I I
I
Position
Center
Periphery
~
II>
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-tN's five
focusing points. The AF-assisl beam is
effective
with
28mm and longer lenses,
lts effective range in darkness is
indicated in the table below. See page
123 for details on when the AF-assisl
beam is emitted.
ENective Range
Appro~. 0.6 -10 m 12· 33
ft.
Approx . 0.6 - 5 m /2· 16.4 ft.
Automatic Reversion to Default Settings
I~
~
8
"
;
(()
~
CLE~ I I
::::::::!
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I
22
When Speedlite 550EX is attached to the
EOS-3, EOS-tN,
or
EOS-t , 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,
E·TTL autoflash"
,,,_
(Ail related settings are canceled.)
Speedlite
Auto zoom
E·TTL autoflash"
,,,
(All related settings are canceled .)
Wireless
CI
ZY"""
Master
Unit
Master flash ON
No Ilash ratio setting
"WIth the EOS·t N and EOS·I, TTL autoflash lakes
effect.