Canon Speedlite 470EX-AI Instruction Manual page 106

Specifications
Exposure Control
Exposure control
system:
Effective flash metering
range:
(with EF50mm f/1.4 lens
at ISO 100)
Flash exposure
compensation:
FE lock:
High-speed sync:
Manual flash:
Modeling flash:
Flash Recharge
Firing interval
(Recharge time):
Flash-ready lamp:
AF-Assist Beam
Method:
Compatible AF system: TTL second image formation phase-difference AF
Effective distance:
106
E-TTL II/E-TTL autoflash, Manual flash
Normal flash: Approx. 0.7 - 23.5 m / 2.3 - 77.1 ft.
Quick flash: Approx. 0.7 - 14.4 m / 2.3 - 47.2 ft.
(at Guide No. 20.2 / 66.3, in meters/feet)
High-speed sync: Approx. 0.7 - 12.5 m / 2.3 - 41.0 ft.
(at 1/250 sec.)
±3 stops in 1/3- or 1/2-stop increments
Possible with the camera's Multi-function button or FE
lock/AE lock button
Possible
1/1 - 1/128 power (1/3-step increments)
Fired with camera's depth-of-field preview button or
Speedlite's test flash button
Normal flash: Approx. 0.1 - 5.5 sec.,
Quick flash: Approx. 0.1 - 3.9 sec.
* When using AA/LR6 alkaline batteries
Lights up in red: Normal flash available
Lights up in green: Quick flash available
Switchable in Personal Functions between Infrared
assist beam and Intermittent flashes (a series of small
flashes)
1 - 19 AF points (Infrared assist beam / 28 mm or longer
lens focal length)
Supported for viewfinder shooting, and Quick mode for
Live View shooting or movie shooting
At center: Approx. 0.7 - 10 m / 2.3 - 32.8 ft.,
At periphery: Approx. 1 - 5 m / 3.3 - 16.4 ft.