Complete with built-in radio transmission wireless functionality, the Speedlite 600EX II-RT sits at the top of Canon`s on-camera E-TTL / E-TTL II compatible flash lineup with a powerful guide number of 197` at ISO 100 and 200mm. This revision improves continuous flash performance by 1.1-1.5x, or up to 2.0x with optional battery pack, simplifies the menu system for faster operation, and includes a specially designed bounce adapter, a hard color filter, and an updated soft case. The two-way 2.4 GHz radio system provides added reliability and a range up to 98.4` among up to 5 groups with a total of 15 individual Speedlites. This system also does not need direct line-of-site like traditional optical-based transmission and will work through obstacles.
For added coverage and functionality, the flash`s zoom head can reach from 20-200mm, with the option for wide 14mm coverage when the built-in diffusion panel is used. Also, the unit can tilt from -7 to +90deg; and rotate 180deg; either left or right for complete bounce capabilities. On the back of the 600EX II-RT is a backlit dot-matrix LCD panel that displays the status and allows users to easily access and change settings. Additionally, the flash is durable with a redesigned contact construction and improved dust and water resistant sealing.
Other capabilities of the 600EX II-RT include a stroboscopic mode as well as high-speed, first and second curtain sync settings for more control over your image`s final look. The flash is powered by 4 AA batteries and has a port for an optional external power pack. The rated recycle time is 0.1-5.5 seconds, but can be sped up to 0.1-3.3 seconds in Quick Flash mode. It comes with a bounce adapter, a hard CTO filter set, a mini stand, and an updated soft case that holds the flash and accessories.

• 2.4 GHz Wireless Radio Transmission
• Compatible with Canon E-TTL / E-TTL II
• Guide Number: 197` at ISO 100 and 200mm
• Zoom Range: 20-200mm (14mm with Panel)
• Tilts from -7 to +90deg;Rotates Left & Right 180deg;1.1-1.5x Improved Continuous Shooting
• High-Speed, 1st & 2nd Curtain Sync
• Bounce Adapter & Hard Color Filters
• Runs on 4 AA Batteries