Nikon Autofocus Speedlight SB-22 Instruction Manual page 42

Next, turn on flash unit and take shot in the same
m a n n e r s h o w n i n " O P E R A T I O N , " s t e p s 1 0 t o 1 4 .
4. Set your chosen aperture.
With Nikon F-401s/N4004s, use camera's
aperture dial.
4 1