Type

Mode: E-TTL II, E-TTL

Compatible Cameras

All Canon EOS cameras; PowerShot G-series cameras and select SX-series cameras

Guide Number

72 ft./22m (at ISO 100); flash head at 28mm zoom setting
89 ft./27m (at ISO 100); flash head at 50mm zoom setting

Recycling Time

Normal flash: Approx. 0.1 to 3.9 seconds; Quick flash: 0.1 to 2.6 seconds (AA-size Alkaline Batteries)

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)
Compatible with model EOS 50D and later. Available via firmware update for: EOS- 1Ds Mark III, EOS-1D Mark III, EOS 40D, EOS Rebel XSi, and EOS Rebel XS.

Bounce / Swivel

Up: 60°, 75°, 90°

Custom Functions

C.Fn-01: Auto power off (Enabled/Disabled)
C.Fn-06: Quick flash during continuous shooting (Enabled/Disabled)