Canon Compatibility
16
To use this flash on a ControlTL radio mounted on a camera at HSS shutter speeds, you first need to enable
HSS mode in the flash. Mount the 270EX directly on a camera (no radio in-between) and enable HSS mode
via the camera’s menus. Once that mode is enabled, the flash will work properly at HSS shutter speeds when
mounted on a MiniTT1 or FlexTT5 when used as a transmitter. HSS operation is automatic (no need to set it)
when used on a FlexTT5 as a receiver.
This flash may have occasional exposure issues when used on a MiniTT1 or FlexTT5 mounted directly on
certain cameras like the 5D Mark II, 40D, 20D, and possibly others.
270EX II
Can be used on the MiniTT1 or FlexTT5 (Transmit or Receive) in ETTL mode.
Significantly range limited due to RF interference from flash only when connected to a remote FlexTT5. See
Long Range Performance.
To use this flash on a ControlTL radio mounted on a camera at HSS shutter speeds, you first need to enable
HSS mode in the flash. Mount the 270EX directly on a camera (no radio in-between) and enable HSS mode
via the camera’s menus. Once that mode is enabled, the flash will work properly at HSS shutter speeds when
mounted on a MiniTT1 or FlexTT5 when used as a transmitter. HSS operation is automatic (no need to set it)
when used on a FlexTT5 as a receiver.
This flash may have occasional exposure issues when used on a MiniTT1 or FlexTT5 mounted directly on
certain cameras like the 5D Mark II, 40D, 20D, and possibly others.
This flash will not do AF assist, as it uses the flash itself to do AF assist on camera, rather than using IR like
other flashes. As such, this different mode is not supported.
320EX
Full Feature Compatiblity
Excellent range performance with this flash.
Some RF interference present when LED lamp is on.
Previous Generation
580EX
Full feature compatibility.
Range limited due to RF interference from flash only when connected to a remote FlexTT5. See Long Range
Performance.
Not range limited when used on a transmitting radio.
430EX
Full feature compatibility.
Significantly range limited due to RF interference from flash only when connected to a remote FlexTT5. See
Long Range Performance.
Not range limited when used on a transmitting radio.
550EX
Full feature compatibility.
Excellent range performance with this flash.
420EX
Full feature compatibility.
220EX
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