For type-a cameras, Basic flash photography – Canon 550EX User Manual

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For Type-A Cameras

Basic Flash Photography

When the Speedlite 550EX is attached to a Type-A camera such as the EOS-

3, you can take flash pictures with E-TTL autoflash as easily as normal
autoexposure (AE) pictures.
As with evaluative metering, the E-TTL autoflash system uses a multi-zone

sensor. A preflash is fired for evaluative flash metering and the reading is
stored in memory. Since E-TTL autoflash is linked to the active focusing point,

the flash exposure is highly accurate. The result is a natural-looking flash

picture with excellent balance between the flash light and ambient light.

This section assumes that the Speedlite 550EX is used with a Type-A camera.
Before proceeding, first turn on the EOS-3 and the 550EX.
Set the SSOEX’s wireless selector to OFF.

For EOS-3 operations, refer to the EOS-3 Instructions.