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CMS-XML Specifications of the 550EX Speedlite.
Flash Coverage ( mm ) ... 77 1/ 400 ... 13 4.5 ... 5.6 3.1 ... 17 5.6 ... 17 5.6 ... 14 4.5
CMS-XML QuickGuide to Canon 320EX Speedlite Features
You should either move closer or increase the ISO. The table on the reverse side provides a guide to minimum and maximum shooting ranges for the EF-S 18-55mm f /3.5- 5.6 IS zoom. Do not use the 320EX in the extended position at a focal length of 18mm or less, or the edges of the frame will be darker than the center.