Switching the Flash Coverage
The flash head can be extended or retracted manually to match the lens focal length. As the focal length of EF lenses and EF-S lenses differs, extend or retract the flash head while referring to the table below (the flash head position in relationship to the lens focal length).
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• When using an EF-S lens with a focal length of 32mm or longer or an EF lens with a focal length of 50mm or longer, extend the flash head for greater flash output and longer flash range.
• When the flash head is extended, the <TELE> lamp on the Speedlite lights or blinks.
• When the <TELE> lamp blinks, retract the flash head to its normal position. If you take a picture while the <TELE> lamp is blinking, the periphery of the picture may appear dark.
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