Canon Speedlite 550EX Instructions Manual page 63
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Also See for Speedlite 550EX:
- Instructions manual (129 pages) ,
- Full manual (50 pages) ,
- Parts catalog (11 pages)
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2.
Wireless E· TTL Autoflash With Flash Ratio ON
As shown in the figure below, the
wireless E-TTL
auloflash system described
as an example consists of a master
unit
set 10 master flash OFF
and
two
slave units.
The slave ID 01 the slave unit on the camera's leh is
A.
The slave ID of
the
slave unit on Ihe camera's right is B.
Master I lash OFF is sel
for the
master
un~.
The camera (attached with the master unn) arid
two
slave
units are properly positioned lor
the
subject
15
m
f49.2f1
•
For indoors
110m!
~
:
• ft ~
B
12m/39.4ft
i
For outdoors
8m
/
26.2ft
• Setting the Flash Ratio for Two Slave Units
:
A and B
With slave unit A being
the
main flash
and
slave unit
B being
the
fill
flash,
the
flash ratio (A:B) between these
two
slave units can be set from 8:1
to
1:1 or
from f:l to
1
:8. (Thirteen 1/2-s\op increments.) In terms of stops,
the
flash
ratio
can
be adjusted from 3:1
to
1:1 or from
1:1
to 1
:3. The
E-TIl
autoflash
system then controls the total flash amount
according
to
the flash ratio to
obtain a
correct
exposure.
63
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