Speedlite 600EX-RT & Speedlite Transmitter ST-E3-RT
What�s New?
What’s New for the Speedlite 600EX-RT and Speedlite
Transmitter ST-E3-RT?
Not Just New, but Revolutionary: Built-in Radio-based
Wireless Control
The limitations of previous optical-type wireless automatic flash units are now bypassed with the introduction of the game-changing Speedlite 600EX-RT.
You Can Now Fire up to 15 Speedlite 600EX-RT Units Off-camera
Fire up the 15 Speedlite 600EX-RT Units Off-camera within a 98-foot radius from the camera
  • With absolutely no cords of any kind, at distances up to 98 feet (30m) from
    the camera — AND, they can be positioned anywhere within a 360° arc of the
    camera position.
  • Fire all flashes at even, E-TTL based power, or use A:B or A:B C ratio control with adjustments up to ±3 stops to adjust exposure ratios.
Totally New! “GROUP” Mode: Control up to Five Separate Groups of 600EX-RT Flashes (A, B, C, D and E) Off-camera
In Group Mode, 1-5 separate flash groups (A, B, C, D, E) can be activated, using the LCD panel
of the master unit. Each group can be assigned a totally independent method of operation.
Allows for completely independent radio-based control of each group from the
�master� unit.
  • Two groups could be E-TTL with full ±3 stop ratio control, another group could be fully manual (you can adjust power level from the “master” unit), and still another group could operate in the External Auto, non-TTL exposure mode.
    • There is no limit to the way the groups can be mixed and matched.
      • Anywhere from one to five groups can be used. Maximum of fifteen 600EX-RT Speedlite possible, regardless of the number of groups.
  • Note: The Group firing mode is only possible with EOS-1D X, EOS 5D Mark III, and later models. If previous models such as EOS 7D or EOS 5D Mark II are used with a Speedlite (or transmitter ST E3-RT) set to Group mode, they’ll convert to traditional E-TTL operation with up to three possible firing groups (A:B, A:B C).
Speedlite Transmitter ST-E3-RT

Dot-matrix LCD display on the
top of the transmitter
Completely New Accessory!
Radio-based Speedlite Transmitter
  • Using the optional transmitter will free up a Speedlite 600EX-RT unit for use off-camera as a slave unit.
  • It is very compact — far smaller on-camera than a 600EX-RT “master” unit.
  • This new unit offers all the radio transmission capabilities than an
    on-camera Speedlite 600EX-RT
    “master” unit would.
    • There are no limits to number of groups or types of operation that users can achieve using the ST-E3-RT transmitter.
  • It has the same dot-matrix LCD display
    on the top of the transmitter as the Speedlite 600EX-RT, making it easy to control.
  • It even offers the same dust- and weather-resistance as the Speedlite 600EX-RT!
  • The transmitter even has its own Custom Functions and Personal Functions.
  • Note: Unlike the Speedlite 600EX-RT, the new Speedlite Transmitter ST-E3-RT is not compatible with the older, optical-based Wireless E-TTL system.
Verify on the “Master” Unit that Each Slave Unit has Recycled and that it’s Ready to Fire
A lightning-bolt icon on the LCD panel of the mater unit, and the optional “beep” will be emitted when all units in a group have signaled that they’re recycled.
Remotely Fire Compatible EOS SLRs
Using either a Speedlite 600EX-RT or ST-E3-RT transmitter, hand-held, fire one or up to 15 EOS cameras remotely — just by pressing a button on the "master" unit. (Requires a 600EX-RT or ST-E3-RT on each camera).
  • With EOS-1D X and EOS 5D Mark III, this communication to fire the camera shutter happens via the hot shoe contacts.
  • Cameras other than EOS-1D X and EOS 5D Mark III require the optional Canon connection cord SR-N3 between “master” unit and camera.
Linked Shooting
Photographers can fire up to 15 EOS cameras from up to 98 feet away, using either
Speedlite 600EX-RT or ST-E3-RT Transmitters to fire the slave cameras.
Fire one camera that has a 600EX-RT or Transmitter ST-E3-RT mounted, and have up to fifteen additional EOS cameras — up to 100 feet away — with either device attached to hot shoe fire simultaneously .
  • There is a slight delay, so precise sync of master & slave cameras is not possible.
  • Flash on any of the cameras can be set to fire or not to fire along with the shutter (default operation is that it won’t fire), using flash Personal Function 7.

To Activate Linked Shooting:

  1. Press AND HOLD the Wireless button on either ST-E3-RT or 600EX-RT until “LINKED SHOT” appears on the LCD panel, along with “SLAVE” or “MASTER.”
  2. For triggering device: Select “MASTER” by pressing Wireless button until it appears, along with “LINKED SHOT.”
  3. For one or more on-camera receiving devices: Select “LINKED SHOT — SLAVE.”
  4. SLAVE 600EX-RT or ST-E3-RT needs to be mounted to hot shoe of compatible cameras; earlier EOS models will need optional accessory SR-N3 cord plugged into camera's remote control socket, and into Wireless Slave device.
Dot-matrix LCD display
Dot-matrix LCD display
Rather than the permanent placement of tiny, hard-to-read numbers and icons that previous EOS Speedlite models had, the new LCD display features a dot-matrix which allows for variable display.
  • This configuration allows much more information to be displayed without overwhelming the user.
LCD Panel Illumination Changes Color Based on Function
  • The background of the LCD panel changes illumination color to alert the user which settings are activated.
    • The illumination color can be customized by the user through the Personal Function settings.
  • The default illumination settings are as follows:
    • Normal, on-camera operation — green illumination
    • Master unit operation — green illumination
    • Slave unit operation — orange illumination
    • Temperature warning — red illumination (only when excess heat detected)
Wider Zoom Range — 20mm Wide Coverage, 200mm
Telephoto Coverage
The Speedlite 600EX-RT can cover a lens as wide as 20mm on a full-frame camera (13mm lens on an APS-C sensor camera such as the 7D or 60D) — without requiring a separate “wide” diffusion panel.

Telephoto coverage can now be narrowed to cover the equivalent of a 200mm lens. The benefits of this coverage range are:

  • Further light reach when using a zoom lens
  • Greater flash-to-subject distance range; especially useful with telephoto lenses.
  • Greater “throw” and control of how and where the light lands.
  • Allows for greater shadow-creation potential when used at a distance off-camera.

Like previous models, includes a 14mm ultra-wide panel that can be pulled-down to further increase the spread of light.

  • Useful for wide lenses such as the 14mm f/2.8L II, 16-35mm f/2.8L, or the
    EF-S 10-22mm*.
  • Ultra-wide coverage with pull-down panel and APS-C sensor cameras: 9mm lens or longer; with full-frame camera, it covers lenses as wide as 14mm.
New! Spread or Concentrate Flash Illumination Across the Frame
With automatic flash head zooming, users have three Light Distribution options in terms of fine-tuning how flash covers the frame, adjusted via a flash Custom Function:
  • Standard: Ideal for scenes where most subjects will tend to be centered
    in frame.
    • Especially with normal and tele lens settings.
  • Guide Number Priority: Flash is concentrated in central area of the frame — effective flash power is optimized.
    • Ideal for telephoto shots of single subjects that don’t require even light coverage out to edges of the frame.
  • Even Coverage: Perfect for group photos and subjects that need even illumination from center to edge.
    • Particularly important for wide-angle lenses.
On-off switch
3-Position On-Off Switch
  • ON, OFF, and LOCK
  • In LOCK setting, all buttons and the rear control dial are prevented from making changes if they’re accidently pressed.
Rear control buttons
Illuminated Rear Control Buttons
  • Allows for easy operation even in total darkness.
  • Users no longer have to move to a brighter part of the room just to make a change to the flash settings.
  • Illumination choices — Auto, always On, or always Off (via Flash or ST-E3-RT Custom Function 22).
18 Flash Custom Functions, and (New!) 7 Flash Personal Functions
  • Includes the 14 functions from previous 580EX II, plus four new ones.
  • In addition, there are seven new functions in a separate “Personal Functions” menu on the Speedlite 600EX-RT’s LCD monitor
    • Gives users control over LCD panel illumination color, Color Filter detection, Wireless button sequence/operation, and whether flash fires during Linked Shooting.
Mode button
All Flash Modes — Including
External Auto — Now Selectable
via Mode Button
Users will no longer have to fish around within the flash custom functions in order to activate the external sensor Auto flash exposure mode (for non-TTL automatic flash).
  • Makes it quicker and easier for users to select and alter settings.
Wireless button
Wireless Operation — Radio vs.
Optical, and Master vs. Slave —
via Single Wireless Button
One single dedicated button will now allow users to toggle between:
  • Basic on-camera operation
    (no wireless control)
  • Radio-based Wireless operation
    (as “master” or “slave” unit)
  • Traditional optical-based Wireless
    (as “master” or “slave”)
    • In previous models, users had to
      hold the zoom button for two or
      more seconds to enable the
      wireless function.
The Speedlite 600EX-RT is supplied with a new, dedicated filter holder, which fits over the front of the flash unit.

Dedicated filter holder

Two separate pre-cut gel-type
filters are also included
Included Color Filters
  • Speedlite 600EX-RT includes a filter
    holder for attachment of gel filters to
    the flash.
  • You also receive two amber gel-type
    color filters!
    • Perfect for correcting flash illumination to match available light.
      • Dark amber filter: reduces color temp, to balance flash with typical tungsten-type ambient light indoors.
        • Minimizes the problem of having overly-yellow or orange-colored backgrounds with a properly-balanced flash-lit subject.
      • Light amber filter: balances flash with common mix of tungsten and daylight ambient lighting, which is often encountered on-location.
  • When the filter and holder are attached
    to the flash, White Balance information
    is communicated to the camera (when
    the camera is set to Flash White
    Balance mode*).
    • Ensures that proper TTL flash exposure and WB color information are taken care of automatically.
  • Requires use of a recent EOS camera that is compatible with communication of color temperature information with EX-series Speedlites: EOS Rebel XS/XSi and newer; EOS 40D and newer; 7D, 5D Mark II and Mark III, and EOS-1D/1Ds Mark III, Mark IV, and EOS-1D X.
Multi Flash Mode — Now as Fast as 500 Hz
When set to Multi mode (“stroboscopic” or repeating flash mode), the maximum number of flashes per second is now an astonishing 500 flashes per second
(500 Hz).
  • This mode allows users to essentially freeze a subject in motion multiple times within the same frame. Allows for creation of beautifully composed motion and action images.
  • For optical wireless operation, maximum firing rate is 199 Hz

What's in Canon Speedlites Click here to see more information about Canon basic features, functions, shooting modes and accessories.

Some images and effects simulated.