Switching Flash Coverage

Flash head (normal position)

The Guide No. is 22/72 (ISO 100 in meters/feet). The maximum flash coverage matches an EF 28mm wide angle lens (EF-S 18mm).

Flash head (pulled forward)

The Guide No. is 27/89 (ISO 100 in meters/feet). The flash coverage matches an EF 50mm (EF-S 32mm) or lenses with longer focal length.

When shooting with a lens wider than EF 50mm (EF-S 32mm), the periphery of the picture may become dark.

See p.26 for guidelines about the flash shooting range.

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