CANON – 600EX II-RT – Speedlite Announced

Canon 600EX II-RT


Canon has announced an upgrade to their flagship 600EX-RT Speedlite, as well as a new 8 cell AA external battery pack.

The new 600EX II-RT speedlite provides up to 2 x faster continuous burst rates, and improved heat protection buffer.

As well as an improved Quick Fire mode on partial recycle, a faster interface and menu system, and new hard gels and diffuser cover.


Canon 600EX II-RT


The 600EX II-RT provides the same functions, and Radio and Optical Wireless modes as its predecessor, as well as the same respectable guide number 60m (ISO100).

Though with the increasingly fast 1DX MKII camera now available, Canon have focused on improving the continuous burst rate of the 600EX II-RT to minimize unfired flashes.

The 600EX II-RT provides speed gains of 1.1 to 1.5x self-powered, and 1.5 to 2.0x when used with the optional Compact Battery Pack CP-E4N.

While heat protection is improved with a combination of highly heat-resistant material, a revised optical design for suppressing gain in the panel’s temperature, and a redesigned interior structure.

An improved flash control algorithm, and a redesigned Quick Flash function, allowing the flash to fire even when it is not fully recharged, also help to minimize unfired flashes in continuous operation.


Canon 600EX II-RT


The 600EX II-RT also provides the faster more intuitive menu system and button press interface, now consistent with the recent 430EX III-RT.


Canon 600EX II-RT




  • Guide Number (GN) 60 Metres at ISO 100 and 200mm
  • HSS to 1/8000th
  • Flash Mode – ETTL II /M / Multi
  • 1st Curtain Sync / 2nd Curtain Sync
  • FEC – 1/3rd Increments
  • Manual Flash – 1/128 – 1/1 Output Control (1/3rd increments)
  • 20-200mm Auto and Manual Flash Zoom
  • 2.4GHz RT Radio Master and Slave Modes
  • Canon Optic Wireless Slave Mode
  • Recycle Time – Normal Flash – 0.1 – 5.5 Sec, Quick Flash – 0.1 – 3.3 Sec
  • Flash Groups – Radio A/B/C/D/E, Optic A/B/C
  • Channels – Radio 1 – 15, Optic 1 – 4
  • 15 Custom Functions, 6 Personal Functions
  • Sound Prompt
  • Heat Protection
  • LCD Back Light
  • Crop Sensor Auto Zoom Option
  • AF Assist Light
  • Head Tilt 90 / -7 Degrees, Swivel 180 Degrees Left & Right
  • Tilt Swivel Lock Button
  • Large Dot Matrix LCD Screen
  • Bounce Card & Wide Angle Diffuser
  • Fast Clamping Foot
  • External HV Battery Port
  • PC Sync Port
  • 2.5mm Port
  • Weather Sealing



Additional Speedlite 600EX II-RT flash features include:

  • Zoom flash head covers wide focal length range of 20–200mm; maximum guide number is 197 ft./60m at ISO 100, making the Speedlite 600EX II-RT flash the most powerful flash unit in the EOS system.
  • Wireless flash shooting support is available for both radio and optical transmission with compatible Canon Speedlites, offering users greater functional range when using flash.
  • Multiple flash system support allows control of up to five groups of compatible Canon Speedlites.
  • Dust- and water-resistant body for reliable operation in harsh environments.
  • Flash-readiness indicator on the display panel, simplified button and dial operation and variable manual flash output.
  • New, specially designed accessories supplied include a built-in bounce adapter, plus SCF-E3 hard-type color filter sets, and a soft case. The new Compact Battery Pack CP-E4N is available as an optional accessory for improved continuous flash firing and more flashes per charge.
  • Illuminated dot matrix LCD panel for enhanced display information, including flash mode and usable distance ranges plus C.Fn (Custom Function) and P.Fn (Personal Function) settings.


The 600EX II-RT flash now also includes light and dark orange hard color correction caps, as well as a diffuser cover which fits over the top of the gels.




A larger soft case which will also fit the accessories (gels, diffuser, and base stand) is also provided.




A new 8 AA cell CP-E4N external battery pack, combined with the 600EX II-RT provides up to 2x faster continual burst rates. Ideal with the new 1DX MKII camera.





Compatible Cameras

Type-A EOS cameras (E-TTL II/E-TTL autoflash)
Type-B EOS cameras (TTL autoflash)

Guide Number

The Guide No. is approximately 49.2 ft./15m at ISO 100.The maximum Guide No. is approximately 196.9 ft./60m at ISO 100 and 200mm flash coverage.When the extendable wide panel is pulled out, the flash coverage is 14mm.

Number of Flashes

Approx. 100-700 flashes.* Nominal min. time when using 1900mm Ah type AA/HR6 Ni-MH batteries.
* Based on Canon Testing Standards.

Recycling Time

Normal flash: 0.1-5.5 sec.
Quick flash: 0.1-3.3 sec.* Nominal min. time when using 1900mm Ah type AA/HR6 Ni-MH batteries.
* Based on Canon Testing Standards.

Flash Range

Effective flash range with EF 50mm f/1.4 lens at ISO 100

  1. Normal Flash:
    Approx. 1.6-91.2 ft./0.5-27.8m
  2. Quick Flash (at Guide No. 68.2 ft./20.8m):
    Approx. 1.6-48.6 ft./0.5-14.8m
  3. High-speed Sync (at 1/250 sec. shutter speed):
    Approx. 1.6-48.2 ft./0.5-14.7m

AF Assist Beam

Infrared AF-assist beamCompatible AF System:
TTL second image formation phase-difference AF
Supporting 1-65 AF points (28mm or longer focal length)

  • Phase-difference AF during viewfinder shooting
  • Quick mode during Live View shooting or movie shooting

Effective Range (Approx.):
At center: 2.0-32.8 ft./0.6-10.0m
At periphery: 2.0-16.4 ft./0.6-5.0m

Custom Functions

15 Functions
6 Functions

Power Source

Four AA-size/LR6 alkaline or AA/HR6 Ni-MH batteries

External Power Source

Compatible (Compact Battery Pack CP-E4N recommended)


Approx. 3.10 x 5.64 x 4.83 in./78.7 x 143.2 x 122.7mm


Approx. 15.34 oz./435g








The Canon 600EX II-RT and CP-E4N battery pack are available now from $579 and $199 respectively.

Pre-orders are available now –

600EX II-RT – Adorama, B&H Photo, Amazon, UK

CP-E4N – Adorama, B&H Photo, Amazon, UK


Canon Website – USA, Europe




  1. robert 5 years ago

    “Normal flash: 0.1-5.5 sec.
    Quick flash: 0.1-3.3 sec.* Nominal min. time when using 1900mm Ah type AA/HR6”

    im guessing a bit better with NIMH. maybe 2.5 secs. why dont they include a rating for nimh.
    thats just as important.
    but $600 is crazy compared to what 3rd party flashes get you for $100-140

    I cant help but feel that its kind of a gyp when they do a mk2/3 flash. to my eyes it seems like they couldnt get it right the first time. kind of like when nikon did the SB900 and then the 910 which is just a tweaked flash. they screwed up with the first one and they release a 2nd one with tweaked specs.

    • Author
      Flash Havoc 5 years ago

      An interesting thing with the Canon flashes, even the original 600EX-RT, is that even though they have a slightly slower recycle time than a lot of third party flashes, they generally well outperform them in a continuous burst.

      So regardless of the recycle specs, you can be pretty sure the 600EX II-RT will outperform most current third party speedlites in continual burst. And generally how soon the heat protection cuts in as well.

      I’m not sure about the MK2/3 comment, that’s like saying Canon didn’t get the original 5D right. Whether you think the original is right or wrong, an improvement is always nice.

  2. Jesse Patterson 5 years ago

    Hey Flash! Canon should hire you to sale and review their products (if they already haven’t). I was completely uninterested in upgrading my 600s however, you have a way of highlighting the good in products like no one else. It’s still not in my favor to upgrade however, this site is proof of how professional you are. When I needed to be convinced of a particular flash, I’ve come here for the final verdict. Thanks!

  3. robert 5 years ago

    I never had a situation in any wedding when the flashes I used didnt sufficiently expose what I needed even at full power. so the power is more than enough. but I had many instances where I said thank god my flashes recycle very quickly. recycling is more critical than power. because you can always open aperture or up the iso. but if its slow, its slow.

    so I dont know if the canon will outperform what you are referring to but mine deliver amazingly. heating issues, I specifically never had, but I have 9 x 3rd party flashes that Id just throw one in the bag to cool off and grab another if it happened. I think the canon has a better thermal system but they also recycle slower giving just a tad more time to dissipate the heat. I havent had any issue with any flash overheating. but I know my friend curses nikon all summer when we shoot because of the SB900’s he uses that fail when he needs them most. the protective front lens already melted and had to be replaced and the bulb burnt out twice. making it VERY costly flash bottom line.

    not many can buy that many canon flashes. not many would want to either instead of investing in better glass. we use our 3rd party flashes with the mindset of them being disposable. and I beat on my flashes without any mercy. not 1 had gone down for the count. and they did go down physically. many of them falling to the floor with wind off a light stand. but they refuse to die. I just think the price to proportion of what they give is off. for outdoor studio BG shots I use the godox 360. 3rd party mfr are making a killing today. no matter what it is.

    regarding my mk2/3 comment. there is big difference in performance there. its not a tweaked camera. its an upgrade. the flash doesnt offer much features that make it a drastic change then the mk1, which says they should have done it from the get go. the same with the SB900 to 910. minor tweaks. cameras are from years of research and better specs all around. better sensor (which is a huge jump) better iso, better wb, better af, more fps, better video etc. the mk1-2 flash here offers just a few tweaks. cheers elvis.

    • Ryan 5 years ago

      Last week at a wedding all the lights were off except DJ lights and one chandelier. All walls including ceiling were brown wood. All shots were firing around full power bounced off a large card. Needless to say even with a lithium pack it went into thermal mode fairly quickly and 8 seconds to recycle.. ended up having to reduce to half power and then really bump up the iso. After this never missed a beat shot after shot at a rapid clip. Not sure how the third party would have responded in this instance but I assume they would be able to keep up at half power?

  4. Andy 5 years ago

    I’m quite happy with Canon 600EX-RT. With new version of it, I hope Canon 600EX-RT price will go down lower, so that i can get 2 more.

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