Canon 420 EZ User Manual
Page 17
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To change the flash head position
manually, press the zoom button until the
desired setting appears, the “M Zoom”
lights. Do not choose a setting larger than
the lens focal length. Always be sure to
set the position equal to or smaller than
the lens focal length, otherwise, exposure
will not be uniform.
The guide number varies according to
the flash head position, see p.34.