Mount Shoe Guide No. 197' (60.05 m) ISO100 at 200 mm position Exposure Control E-TTL / E-TTL II, Manual Angle of Coverage 94° - 12° Wide-Angle Adapter: 114° Vari-Power 1/1 - 1/128 Bounce Head -7° to +90° Swivel Head 360° Coverage 14 mm - 200 mm (Full frame) Distance Range 1.64 to 98.43' (0.5 to 30 m) at f/1.4 Zoom Head Full frame: 20 mm - 200 mm Off-Camera Terminal PC, Proprietary Recycle Time Approximately 0.1 - 5.5 seconds Flash Duration 0.0018 - 0.0023 sec @ Full Power Flash-Ready Indicator Yes Compensation -3 EV to +3 EV (in 1/2 and 1/3 EV steps) Wireless Operation Method: RF Distance: Up to 98.43' / 30 m Method: Optical pulse Distance: Up to 49.21' / 15 m Wireless Communication Channels 4 Channels Wireless Groups 5 Groups Power Source 4x AA Alkaline, Lithium, Rechargeable NiMH Batteries Dimensions (WxHxD) 3.1 x 5.6 x 4.9" / 80.0 x 143.0 x 125.0 mm Weight 15 oz / 425 g without batteries Packaging Info Package Weight 2.0 lb Box Dimensions (LxWxH) 6.6 x 5.9 x 4.6"