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Flash modes and functions
Master and remote flash units’ available flash modes
in the SU-4 type wireless multiple flash operation
Master flash unit
Non-TTL auto, Distance-priority manual flash and manual flash modes can
be set.
Press the [MODE] button, then turn the selector dial to choose the desired
flash mode.
When the SB-900 is set as the master flash unit, monitor pre-flashes will not fire.
Remote flash unit
AUTO (auto) and M (manual) modes are available.
Press the [MODE] button, then turn the selector dial to choose AUTO or M mode.
(auto) mode:
In the A mode, the remote flash units start and stop firing in sync with the
master flash unit.
The maximum distance the SB-900’s light sensor can detect is approximately
7 m (23 ft.) or less in the front position of the master unit.
(manual) mode:
In the M mode, the remote flash units only start firing in sync with the
master flash unit.
The maximum detectable distance of the SB-900’s light sensor can detect is
approx. 40 m (131 ft.) in the front position of the master unit.
The flash output level can be set from M1/1 to M1/128.
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