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Wireless E-TTL Flash Operation
The “Slave” function allows the ash to be triggered
wirelessly when used off-camera with an EOS DSLR or
Speedlite with master ash function. The slave ash must
be positioned off-camera and must be within a range of 33
feet (10 meters) from the master ash unit.
You can use the 270EX II regardless of the transmission
channel (1 to 4) on the master unit. The slave ID is set to
group A and cannot be changed to group B or C.
1. Set the camera, ST-E2 transmitter or 580EX II
Speedlite as the master unit.
2. Set the 270EX II as the slave unit by moving the
power switch to <SLAVE>.
3. Attach the 270EX II to the mini-stand provided with the
ash case and position the ash. When outdoors you
must have the wireless sensor aimed directly toward
the master unit. When indoors the sensor will react to
reections from nearby walls.
4. Release the shutter.
Wireless Shutter Release
The ash release function uses the 270 EX II’s built-in
infrared transmitter to remotely re compatible cameras*
with a 2-second delay. You can choose whether to use the
270EX II as a wireless trigger alone or whether to also use
it as a wirelessly triggered slave ash.
To trigger camera only
1. Set the camera* to its remote control shooting mode.
2. Set the 270EX II power switch to <ON>
3. Point the remote control transmitter on the front of the
270EX II toward the camera, then press the remote
release button. The shutter will release two seconds
later. The 270EX II will not re.
To trigger camera* + wireless ash:
1. A wireless E-TTL "master" ash or ST-E2 transmitter
must be mounted and active.
2. Set the 270EX II power switch to <SLAVE>.
3. Set the camera* to Remote/Self-Timer mode.
4. Point the remote control transmitter on the front of the
270EX II toward the front of the camera, then press
the remote release button. The camera will re two
seconds later, which allows time to reposition the
270EX II to illuminate the subject. The on-camera
master ash will trigger the 270EX II you’re holding to
re during exposure.
*Currently available only on EOS Digital Rebel, Rebel XT, XTi,
XSi, T1i, T2i, T3i, EOS 7D, and 5D Mark II.
Auto Power Off
The 270EX II will automatically shut off after 90 seconds of
idle use to save battery power. Press the camera’s shutter
button to turn the unit on again. Cancel the auto power off
function when using the 270EX II as a wireless slave by
pressing the [✻] button on your camera.
AF-Assist Beam
To facilitate autofocus for dark scenes, the 270EX II may
re repeatedly when you press the camera’s shutter button
halfway. Its maximum AF-Assist range is approximately
4 m/13.1 ft., depending on the ISO setting and maximum
aperture of your lens.
Modeling Flash
Pressing the camera’s depth-of-eld button will re the
ash continuously for 1 sec. This enables you to preview
lighting effects on the subject. It is most useful when the
ash is positioned off-camera.
Do not re the modeling ash more than 10
consecutive times. If you re the modeling ash 10
consecutive times, allow the Speedlite to rest for at least 10
min. to avoid overheating and damaging the ash head.
E-TTL II Flash Range with 18-55mm EF-S f/3.5-5.6 IS Zoom
ISO Normal Position Extended Position
18mm 55mm 18mm 55mm
100 1 – 6.3 m
3.3 – 20.6 ft
1 – 3.8 m
3.3 – 12.9 ft
— 1 – 4.8 m
3.3 – 15.9 ft
200 1 – 8.9 m
3.3 – 29.1 ft
1 – 5.5 m
3.3 – 18.2 ft
— 1 – 6.8 m
3.3 – 22.5 ft
400 1 – 12.6 m
3.3 – 41.1 ft
1 – 7.9 m
3.3 – 25.7 ft
— 1 – 9.6 m
3.3 – 31.8 ft
800 1 – 17.7 m
3.3 – 58.0 ft
1 – 11.1 m
3.3 – 36.3 ft
— 1 – 13.6 m
3.3 – 45.0 ft
1600 1.5 – 25.1 m
4.9 – 82.6 ft
1 – 15.7 m
3.3 – 51.6 ft
— 1 – 19.3 m
3.3 – 63.6 ft