OVERVIEW
As with other Canon professional Speedlites, the 600EX-
RT has a host of custom functions that allow you to adjust
specic ash functions to your preference. It also includes
seven personal functions for altering options specic to
the 600EX-RT. This QuickGuide will list and explain every
available option. By convention, Canon numbers each op-
tion, with 0 (zero) as the factory default setting. When you
change the number to anything other than 0 you change
the factory default and customize the setting.
CUSTOM FUNCTIONS
To set a Custom Function (C.Fn):
1. Press and hold in Fn Button 1 <Zm/C.Fn> until the
Custom Functions screen appears.
QuickGuide to Speedlite 600EX-RT
Custom and Personal Settings
2. Turn the Select Dial to the Custom Function number of
your choice.
3. Press the Set/Set Button to access the C.Fn.
4. Turn the Select Dial to the C.Fn setting you want.
5. Press the Set/Set Button to register your setting.
6. Press Fn Button 4 to return to the ash-ready state.
C.Fn-00 – Distance indicator
0: Meters
1: Feet
The default is meters. U.S. users may prefer to set the
distance indicator to feet. When set to feet, it will remain so
even after you clear all custom functions. You must there-
fore reset it separately.
C.Fn-01 – Auto power off
0: ON (Enabled)
1: OFF (Disabled)
When set to 0 the ash will automatically “go to sleep” after
90 seconds of inactivity. It does this to conserve battery
power. You can “wake” the ash by tapping your camera’s
shutter button or the test ash button on the ash. If you
set this function to 1 the ash will stay on until you switch
it off or the battery runs out of power. Note: Use C.Fn 10 to
set the power-off timer for slave units.
C.Fn-02 – Modeling ash activation
0: Depth-of-eld preview button enabled (on camera)
1: Test ring button enabled (on ash)
2: Depth-of-eld + Test ring button enabled
3: OFF (Disabled)
Photographers who nd the modeling ash feature useful
can choose one of three options for how to trigger it. If you
nd this unnecessary or distracting you can turn it off.
C.Fn-03 – FEB auto cancel
0: ON (Enabled)
1: OFF (Disabled)
If you turn this function off then the ash will not
automatically cancel ash exposure bracketing (FEB) after
a 3-exposure bracket. Instead, it will continue FEB until
you disable it manually. This is useful when you want to
continuously bracket each shot.
C.Fn-04 – FEB exposure sequence
0: 0 — +
1: — 0 +
If you change this function to 1 you change the FEB
sequence to “under-exposure normal exposure
over-exposure.”
C.Fn-05 – Flash metering mode
0: ETTL II
1: TTL
2: Ext.A (External metering – Auto)
3: Ext.M (External metering – Manual)
Set this function to 1 only if you are using an EOS Type-B
lm camera. Do not set this function to 1 if you are using
an EOS digital camera. External metering will work with
either lm or digital cameras.
C.Fn-06 – Quickash with continuous shooting
0: OFF (Disabled)
1: ON (Enabled)
This feature allows you to re the 600EX-RT when the
ready light is green, before the ash is fully charged. It
is normally disabled during continuous shooting. If you
choose to enable it, the power output will be lower, which
in turn will reduce the effective ash range. You may need
to reduce the ash-to-subject distance, increase the ISO,
or both, to compensate.
C.Fn-07 – Test ring with autoash
0: 1/32 power
1: 1/1 full power
This function controls test ash output when you are in
E-TTL or TTL mode. When set function to 1, the test
ash will be much brighter but will require more battery
power and a longer recycle time. A full-power test ash
can therefore be a useful indication of remaining battery
power, because the longer the ash takes to recycle after
the test ash, the less battery power you have left.
C.Fn-08 – AF-assist beam
0: ON (Enabled)
1: OFF (Disabled)
Turning the ash’s autofocus assist beam off can be use-
ful if it would otherwise distract or alarm your subjects.
C.Fn-09 – Auto zoom for sensor size
0: ON (Enabled)
1: OFF (Disabled)
When ash coverage is set to Automatic <A>, the
600EX-RT will automatically adjust its angle to coverage
to match the eld-of-view of your lens and image sensor. If
you set this C.Fn to 1, the ash will automatically adjust its
angle of coverage to match full-frame/35mm format only.
C.Fn-10 – Slave auto power-off timer
0: 60 minutes
1: 10 minutes
You may want to reduce the time before a slave ash
Custom Function Screen
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(32 pages)
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