Canon Speedlite 550EX Instructions

Short Description
The Canon Speedlite 550EX is a powerful, high-output flash unit featuring E-TTL (Evaluative-Through-The-Lens) autoflash control. It can be used as an oncamera Speedlite or as a master or slave unit in a wireless, multi-Speedlite system. When used with Type-A cameras (listed below), the 550EX obtains natural-looking flash pictures by balancing the flash output and existing light. The 550EX also enables high-speed sync (FP or Focal-Plane flash), FE (Flash Exposure) lock, FEB (Flash Exposure Bracketing), bounce flash and area AF-assist. When used with Type-B cameras (listed below), the 550EX works as a TTL autoflash unit. With Type-B cameras, some 550EX features are not available. Refer to the tables below to check your camera type and the features available. This Instructions booklet has separate sections for Type-A and Type-B cameras. Read the section which applies to your camera.

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Content
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The Speedlite’s flash head zooms automatically to provide adequate flash coverage for the current lens focal length. The Speedlite can provide adequate flash coverage for 24mm to 105mm lens focal lengths. If a zoom lens is zoomed, the flash head also zooms to suit the lens focal length. The flash head’s zoom setting can also be set manually. The Speedlite’s built-in wide panel provides flash coverage for 17mm wideangle lenses.
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• If the built-in wide panel is used and the flash head is turned or tilted for bounce flash, the flash result may look uneven. The LCD panel display will blink as a warning.
• Do not pull out the wide panel too hard. Otherwise, the wide panel may come off.
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In low-light or low-contrast situations, the Speedlite emits the AF-assist beam automatically to assist autofocusing. The AF-assist beam is compatible with the AF of all EOS cameras. The AF-assist beam is effective with 28mm and longer lenses. Its effective range in darkness is indicated in the table below. See page 123 for details on when the AF-assist beam is emitted.
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