Nikon Autofocus Speedlight SB-24 - Manual (Page 101)

GSI
ISO
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0.60.811.5 2 3 4 6 9 1318 m
2 3_ 4 5 7 1015 20304060 ft
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Using manual adjustment, set the SB-24’s zoom head to
' correspond to the focal length of the lens you are using.