Canon Speedlite 550EX Instructions Manual page 119

Specifications
Flash-ready indication:
(t)
Red pilollamp indicates normaillash ready.
(2) Yellow pilot lamp indicates quick lIash ready.
AF·assist beam linkage and range:
Wireless lunctions
Transmission system:
Configuration:
Wireless switchover.
Linked to area AF (45 locusing points), effective lrom approlt. 0.6 to 10
meters 12 to 33 feet at the center and 0.6 to 5 meters 12 to 161eet alol1g
the periphery (in total darkness).
Optica l pulse transmission
Camera, masler unit, and slave unit(s)
Wrth wireless selector
Wireless selector positions:
Channels:
[Master
un~l
Transmission angle:
Transmission raoge:
No. 01 transmissions:
Control lable slaves:
Flash control:
Flash ratio contrOl:
Master flash:
[Slave unit]
Reception angle:
Rash coverage:
Rash-ready indication:
Flash modes:
OFF, Masler, Slave
,
Horizontal: Approx. 80° I Vertical: Approx. 60" (AI I!J 2'1""" zoom setting)
(Manual zooming 01 flash head also enabled)
Indoors: Approx. 12 to 15 meters 139.310 49.21eet
Ouldoors: Approx. 810 10 melers 126.2 to 32.81eel
Approx. 1500 (without master unit firing)
A. B. C (3 groups)
(1) E-TTL autollash (with Type-A Gameras)
High·speed sync (FP flash)
1
FE lock 1 flash exposure compensation 1
FEB 1 flash ratio control
(2) Manuaillash (with Type A and B Gameras)
(3) Stroboscopic flaSh (with Type A and B cameras)
A:B
=
8:1 to 1:1 or 1:1 10 1:8 (In thirteen 1I2-stop increments)
(For C, flash exposure compensation Gan be set up to ±3 stops in 1/3 or
tl2-stop increments.)
ONIOFF possible (When ON, automatic set as slave unit A.)
Horizontal: Approx. 80·' VertiGaI: Approx. 80"
Set automatically to I!J 2'1""" (Manual zooming 01 flash head also enabled)
AF·assist beam em itter blinkS
(1) Controlled automatica lly by master unit.
(2) Manuaillash and stroboscopic flash saltable independently from master
unit.
Flash exposure compensation:
Sellable individually with each slave unit up 10 ±3 stops in 1/3- or 112-stop
increments.
Slave Opera~on Confirmation:
Enabled wilh master unifs test tiring button.
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