Canon 550 EX - Manual (Page 23)

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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 550EX’s wireless selector to OFF.
• For EOS-3 operations, refer to the EOS-3 Instructions.
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