Nikon Autofocus Speedlight SB-22 Instruction Manual page 55

To eliminate harsh shadows caused by ambient
daylight, decrease flash illumination by one or
two f/stops using one of the methods below,
1. Use an aperture one or two f/stops smaller
than that determined in step 2 in combina­
tion with a shutter speed slower by one or
two steps.
2. Use a flash-to-subject distance from 1.4 to
two times longer than that determined using
the equation in step 3.
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