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Review Summary
2024-03-22T20:00:00
Loved this flash for many years, but these flashes are no longer reliable and lose sync with the trigger. Likely due to radio interference from either wifi or cell signals. I have 3 of them and 2 triggers and they are essentially worthless for intended purpose now.
AzDale

2024-03-22T20:00:00
Loved this flash for many years, but these flashes are no longer reliable and lose sync with the trigger. Likely due to radio interference from either wifi or cell signals. I have 3 of them and 2 triggers and they are essentially worthless for intended purpose now.
Dale2

2023-11-02T20:00:00
Very unreliable radio connection in settings with Wi-Fi interference; like everywhere other than a park. There is no fix. Problem is well documented on Canon user forum. It's a shame as the build quality and feature set is up to canon standards. It's just useless if you need reliable off camera flash.
Anson

2016-06-18T14:50:24
Great unit with useful accessories
terry m.
2016-06-15T08:44:24
I really like it. Took it on an indoor museum shoot and it did well. I didn't have time to read the manual but got a few things figured out. The photos turned out much better than I anticipated.
JANICE H.
2016-05-12T11:56:18
The speed lite integrates perfectly with Canon cameras. Powerful and consistent. The strobe-light is particularly useful for action photography. The lcd screen is intuitive and easy to use. I highly recommend this product.
THOMAS R.
2016-02-15T13:14:08
I received my order on time. I paid the same price I would have paid on other sites but Adorama offered extra gear at no additional price. They were nice goodies too! Besides, Adorama is a camera store. I would rather buy from someone who knows what they are selling.
PAUL M.
2016-02-07T18:02:19
Love the 600 EX RT and accessories.
Victor S.
2013-12-06T19:00:00
This flash is BIG improvement over the 420 EX and 580 EX! Weather resistant seals, much improved locking mechanism, a lot of getting used to in features available. Mine worked perfectly out of the box with or without the flash cord on my 7D. Unfortunately the 7D doesn't have wireless, just optical, triggering. But still, all WITHOUT any cords to come unplugged, short out, etc. etc. The other reviewer should have contacted Adorama with his problem instead of just complaining about it! They'd have solved it, quickly. Always have for me.
Flyguy
2012-12-13T19:00:00
The Flash works straight out of the box when mounted directly on EOS 5D Mark III but no way to attach flash to kit supplied fash bracket with kit supplied off camera TLL cord because their is no male hot shoe mount on one end of the cord. The flash bracket packaging clearly shows an off-camera TTL cord with male portion of a hot shoe mount on both ends of the cord. Look at the picture of the flash bracket and you will see a hot shoe clamp where the flash attaches. Now look at the off camera TTL cord and it is flat on the bottom on the end where the flash attaches terefore there is no way to fasten the cord end attached to the flash to the hot shoe clamp on the flash bracket making the flash bracket virtually useless.
JAMES G.
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As Expected
By terry m.
Great unit with useful accessories
600EX-RT very nice
By JANICE H.
I really like it. Took it on an indoor museum shoot and it did well. I didn't have time to read the manual but got a few things figured out. The photos turned out much better than I anticipated.
Canon's new Speedlite 600EX-RT is engineered to provide a new level of performance and reliability for professional flash photography with today's most advanced DSLRs. With wireless two-way radio communication, the Speedlite 600 EX-RT allows photographers to expand their creativity using wireless speedlites with the reliability of radio triggering. The Speedlite 600EX-RT offers an expanded zoom range and a higher guide number, plus a number of improvements over its predecessor in both operation and feel. It features a new dot-matrix LCD panel for display of all pertinent shooting information, backlit controls plus an internal sound generator. Reliability is ensured with improved hot shoe contacts, improved flash head durability and the most comprehensive dust and water sealing system ever on a Canon Speedlite flash. A new color filter holder helps maintain accurate color in a variety of ambient light conditions.

New wireless multiple flash system using radio wave communication for enhanced control of up to five groups of flashes
In addition to traditional optical wireless transmission, the Speedlite 600EX-RT facilitates radio controlled, two-way wireless transmission up to 98.4 feet, among up to 5 groups with a total of 15 individual Speedlites. Communicating on 2.4 GHz frequencies, the Speedlite 600EX-RT does not have the same directional limitations of traditional wireless optical transmitters. 15 transmission channels are available, selectable manually or automatically, and radio transmission IDs can be set to prevent misfiring in the event of signal interference on the same channel.

Zoom flash head covers wide range of 20-200mm
The Speedlite 600EX-RT has an improved guide number of 197ft. (60m) at ISO 100. It offers 20mm to 200mm coverage, and when the extendable wide panel is pulled out, flash coverage moves as wide at 14mm. Plus, to maximize power and minimize energy consumption, the Speedlite 600EX-RT can be directed to zoom in accordance with the cameras image sensor size (full-frame, APS-H & APS-C).

Redesigned contact construction, improved flash head durability, and exceptional dust and weather resistance for reliable operation
The flash head is more rugged and durable than its predecessor and a redesigned hot shoe contact ensures seamless communication. Dust and water resistance has been improved significantly as well: all moving parts and areas surrounding the flashes display and buttons are sealed for uninterrupted performance in harsh conditions. A new dust and water resistant adapter for the mounting foot creates a dust and water resistant seal between camera and flash.

AF Assist Beam compatible with Canon's new 61-Point High Density Reticular AF
Working in conjunction with EOS SLR's, the Speedlite 600EX-RT automatically provides illumination using its built-in AF assist beam. This means more accurate AF, faster, even in dark or low contrast situations, with all lenses 28mm or longer. Compatible with the AF frame of all EOS cameras, the Speedlite 600EX-RT even works perfectly with the 61-Point High Density Reticular AF found in the EOS-1D X, EOS 5D Mark III.
Dot matrix LCD panel and backlit button provide easy visibility
The Speedlite 600EX-RT features an all-new dot matrix LCD panel (172 x 104 dots). This new LCD displays Flash status, wireless configuration and all flash settings with more detailed information in comparison to previous systems. With its new screen combined with backlit operation buttons, the Speedlite 600EX-RT is as easy to operate in the dark as in daylight.
Color filter holder for attaching Canon and third-party color gelatin filters
The Speedlite 600EX-RT features a new color filter holder. By placing a color filter over the front of the flash head, the color temperature of the flash can be made to match that of the ambient light. Color information and light output decrease can be transmitted from the Speedlite 600EX-RT to the camera for proper white balance and exposure.
18 Custom Functions and 7 Personal Functions for creative flexibility
Options include Flash exposure bracketing controls, modeling flash, test firing controls, AF assist control, power and energy saving features, beep and much, much more. Personal functions, like LCD panel illumination color and Master/Slave configurations are also easily set on the Speedlite 600EX-RT.
Full swivel, 180° in either direction
The head can be angled 90° up, 7° down and can rotate 180° left and right. A bounce lock with release button helps things stay in place. Additionally, when the flash head is positioned front and up 90°, the Speedlite 600EX-RT features a catch light panel to create catch light in the eyes of the subject for a more expressive look