As shown in the figure below, the wireless E-TTL autoflash system described as an example consists of a sender unit set to sender flash OFF and two receiver units. The receiver ID of the receiver unit on the camera's left is A The receiver ID of the receiver unit on the camera's right is B
Flash exposure compensation with receiver unit C can be set up to +/- 3 stops in 1/3 or 1/2 stop increments The receiver ID of the receiver unit on the camera's left is A The receiver ID of the receiver unit on the camera's right is B
The sender unit can also be set for bounce flash With sender flash OFF, you can use one receiver unit as a wireless off- camera Speedlite Any number of receiver units can be used
With 50 mm f/ ... ... Type-A cameras ) ... Type-B cameras ) Flash Metering ... ... Type-A cameras ). ... Type-A cameras ). ... Type-A cameras ). ... Type-B cameras ). ... stop increments with cameras equipped with flash ... AF Assist Beam Wireless Functions Camera , sender unit ... (s) Wireless Switchover With wireless selector Wireless Selector Positions ... Type-A cameras ) High- ... ... A and B cameras ) ... A and B cameras ) Flash Ratio ... AF- assist beam emitter blinks ... ... by the following wireless operations:
When you set the synchronization mode to high-speed sync (FP flash), the camera can synchronize with the 550 EX all all shutter speeds. When high speed sync has been set
The FE lock's preflash fires at about 1/32 output With Type-A cameras other than the EOS-1D, !v and 3, the AE lock button functions as and FE lock button when the 550 EX is recharged and ready If the subject is small, using FE lock might not make any difference
Flash exposure compensation with the 550 EX can be set up to +/- 3 stops in 1/3-stop increments (or 1/2-stop increments with some cameras ). You can also use flash compensation in combination with normal exposure compensation (to control the background's exposure level) in a flash picture.
