Type : Mode: E-TTL II, E-TTL
GN : 72 ft./22m (at ISO 100); flash head at 28mm zoom setting
89 ft./27m (at ISO 100); flash head at 50mm zoom setting
Flash Range : (At ISO 100, with EF 50mm f/1.4)
For normal (28mm): 2.3-51.5 ft./0.7-15.7m
For tele end (50mm): 2.3-63.3 ft./0.7-19.3m
For high sync speed (at 1/250 second): Approx. 2.3-24.9 ft./0.7-7.6m
AF Assist Beam : Intermittent flash firing system
Effective range : At center: Approx. 13.1 ft./4m
Periphery: Approx. 11.5 ft./3.5m (in total darkness)
Bounce / Swivel : Up: 60°, 75°, 90°
