Page 151 - (DK) Advanced Photography Guide

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MASTER AND ZOOM FLASH
SLAVE FLASHES The zoom control of a flash enables you to screen in the head, which you can pull out

A master (or commander) vary the width of the light given off by the to spread the light more widely when you are
unit is the trigger that flash when it fires. The zoom usually adjusts using lenses that are wider than 24mm. You
controls how and when automatically to match the focal length of the can also adjust the zoom manually. Using the
a slave flash fires. The lens and thereby ensure that there is an even zoom at its longest setting produces a narrow
master is usually either spread of light in the photo. The zoom range is beam of light that enables you to illuminate
attached or connected to usually from 24-105mm (full-frame equivalent). one specific part of a scene to a greater extent
the camera, whereas the Some flashes also have a wide-angle adapter than its surroundings.
slave flash is positioned Coverage too narrow Coverage good Coverage too wide
on its own, away from
the camera. A master Lens’s angle of view Lens’s angle of view Lens’s angle of view
flash that has neither an
optical sensor nor built-in
radio triggering can be
temporarily modified
with either an optical
slave flash or a radio
trigger accessory. These
fit onto the master flash’s
hotshoe and tell the slave
flash when to fire.

Wireless Wireless Wireless
flash flash flash

CHANNELS

Both the trigger (regardless of whether
it is optical or radio) and the flash need
to be assigned to the same channel,
typically one of four. This ensures that
the trigger can connect to the flash
without interference. If two or more
people are using a wireless flash in the
same area, they should each use a
different channel to prevent one
person’s trigger from accidentally ▲ CAMERA FLASH SETTINGS ▲ FLASH CHANNEL SETTINGS
firing the other person’s flash.
A group consists of two or more fired by the master flash or radio for creative effect, using one group of
wireless flashes that share the same trigger. The advantage of creating flashes as the main light. All the groups
exposure setting. You can usually set multiple groups is that it enables you that you set up, however, still have to
up multiple groups, all of which are to vary the light output of each group share the same channel number.

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