Zoom flash head covers a wide range of 20-200mm Equipped for flash photography in a wide variety of situations, the Speedlite 600EX II-RT has a guide

Zoom flash head covers a wide range of 20-200mm Equipped for flash photography in a wide variety of situations, the Speedlite 600EX II-RT has a guide number of 197 ft. (60m) at ISO 100 to help achieve the lighting you desire. It offers 20mm to 200mm coverage, and when the extendable wide panel is pulled out, flash coverage moves as wide as 14mm. Plus, to maximize power and minimize energy consumption, the Speedlite 600EX II-RT can be directed to zoom in accordance with the camera's image sensor size (full-frame and APS-C).  Improved performance of continuous flash by approx. 1.1 to 1.5x* for fast firing (up to 2.0x* if used with optional Compact Battery Pack CP-E4N). Wireless flash shooting support is available for both radio and optical transmission, offering users greater functional range when using a flash. Multiple flash system allows control of up to five groups of flashes. Dust- and water-resistant body for reliable operation in various environments. New features include a flash-readiness indicator on display panel, button and dial operation and manual flash output for ease of operation. New, specially designed accessories include a bounce adapter, SCF-E3 color hard-type filter sets and a soft case. Dot matrix LCD panel for enhanced display information, including flash mode, C.Fn and P.Fn for quick and convenient visibility. 15 Custom Functions and 6 Personal Functions for creative flexibility. Full swivel, 180° in either direction.