Features

• New wireless multiple flash system using radio wave communication for enhanced control of up to five groups of flashes.
• Zoom flash head covers wide range of 20-200mm; maximum Guide Number (197 ft./60m at ISO 100).
• Redesigned contact construction, improved flash head durability, and exceptional dust and weather resistance for reliable operation.
• AF Assist Beam compatible with Canon's new 61-Point High Density Reticular AF.
• Dot matrix LCD panel and backlit button provide easy visibility.
• Color filter holder for attaching Canon and third-party color gelatin filters.
• 18 Custom Functions and 7 Personal Functions for creative flexibility.
• Full swivel, 180° in either direction.

New wireless multiple flash system using radio wave communication for enhanced control of up to five groups of flashes.

The Speedlite 600EX-RT represents the next generation in wireless flash systems. 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. Where other wireless signals can be interrupted by physical obstacles, radio controlled systems excel. 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

Specifications:

Compatible Cameras 
E-TTL II/E-TTL Autoflash EOS DSLR

Guide Number 
The maximum Guide No. is approximately 196.9 ft./60m at ISO 100 varies from approximately 85.3 ft./26m to 196.9 ft. /60m according to the flash coverage (20 to 200 mm). 

When the extendable wide panel is pulled out, the flash coverage is 14 mm and the Guide No. is approximately 15/49.2

Number of Flashes 
Approx. 100 - 700 flashes (with size-AA/LR6 alkaline batteries)

Recycling Time 
Normal flash: Approx. 0.1 - 5.5 sec.
Quick flash: Approx. 0.1 - 3.3 sec.


- With size-AA/LR6 alkaline batteries
- Flash-ready state indicated by beep sound

Flash Range 
Effective flash range at ISO 100 

Normal Flash

* The flash shooting range can be calculated using the equation "Guide No. ÷ set aperture value".
*Rounded off to the first decimal place. 

Quick Flash

High-speed Sync (at 1/250 sec.)

AF Assist Beam 
System: Near-infrared light pattern projection method
Linkable AF Points: Supports 1 to 61-Point High Density Reticular AF
Supported focal length: 
- EF Lens: 28mm or greater
- EF-S Lens: 18mm or greater 

Effective Range (Approx.):
At Center: 2.0 - 32.8 ft. / 0.6 - 10 m
Periphery: 2.0 - 16.4 ft. / 0.6 - 5 m

Custom Functions 
18 Functions 

Personal Functions
7 Functions

Power Source 
Four AA-size/LR6 alkaline or rechargeable Ni-MH or Lithium Batteries

External Power Source 
Compact Battery Pack CP-E4

Dimensions 
Approx. 3.1 (W) x 5.6 (H) x 4.9 (D) in. / 79.7 (W) x 142.9 (H) x 124.5 (D) mm
*Excluding color filter holder

Weight 
Approx. 15.0 oz / 425 g