Canon Macro Ring Lite MR-14EX II - Manual (Page 74)

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Troubleshooting Guide
When the shooting mode is set to the aperture-priority AE (f) mode
and the scene is dark, slow sync is enabled automatically (the shutter
speed becomes slower). Use a tripod, or set the shooting mode to the
program AE (d) or fully automatic mode (p.21). Note that you can also
set the sync speed in [Flash sync. speed in Av mode] (p.40).
Set the shooting mode to d/s/f/a/F (Creative Zone mode) (p.13).
Wireless Multiple Flash Shooting with Optical
Transmission
Flash ratio control and wireless multiple flash shooting are disabled when
the flash mode is set to TTL autoflash. Set C.Fn-05 to 0 (p.62).
Check that < :> and <M> are displayed on the master unit’s
screen (p.47).
Check that the firing group of the slave unit is set properly.
Set the transmission channels of the master unit and slave unit to the
same numbers (p.48).
Check that the slave unit is within the transmission range of the master
unit (p.44).
Point the wireless sensor of the slave unit toward the master unit (p.44).
If the master unit and slave unit are too close, the transmission may not
operate properly (p.74).
The picture is very blurred.
Flash ratio, flash exposure compensation, or FEB cannot be set.
Wireless multiple flash shooting is disabled or
single-side firing is disabled.
The slave unit does not fire.
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