Canon Speedlite 600EX-RT / Speedlite 600EX professional flash is designed to meet the professional flash standards that bring more effective flash photography in more situations than previously possible. It has an improved maximum Guide No. of 60 and an expanded flash coverage from lens' focal length 20mm to 200mm. A range of flash modes are supported such as E-TTL II / E-TTL / TTL autoflash, Flash External Metering, Manual Flash and Stroboscopic Flash for meeting various needs under different situations.
The Speedlite 600EX-RT also features built-in radio trigger, providing reliable off-camera flash at distances of up to 30m (98.4 feet), even around corners.