Yongnuo Yn 600 Fully compatible with Canon?s 2.4 GHz radio flash trigger system and E-TTL / E-TTL II metering, the Speedlite YN600EX-RT from Yongnuo is designed as a useful accessory for your Canon camera. It features a powerful guide number of 197? at ISO 100 and 200mm as well as an impressive zoom range of 20-200mm, along with a wide-angle panel for 14mm coverage on full-frame cameras. Bounce lighting is also possible with tilt from -7 to 90? and rotation left and right 180?.