Canon flash 600ex II-RT

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./60mat ISO 100). Redesigned contact construction, improved flash head durability, and exceptionaldust 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.