Nikon Speedlight SB-16 Instruction Manual page 28

-CONTROLS IN DETAIL-continued---------
For non-TTL automatic (A) operation
For non -TTL automatic operation , you can select one of
two flstops , indicated by the blue and orange aperture
indicator lines at the bottom of the calculator dial. After
determining the aperture , set the shooting mode selector
corresponding to the aperture you selected .
28
Example 1
If you are using ASA/ISO 100 film (with the zoom head
set at N for a 35mm lens), the usable aperture is f/8 at
the blue A1 setting and f/4 at the orange A2 setting . The
automatic shooting range in this case is 0.6 to 4.0m
(2 .0 to 13 ft.) at A 1 and 0.6m to 8.0m (1 .0 to 26 ft.) at A2 .
For a subject more than 4m away, 'the only usable flstop
is f/4 . With a subject 3m away, you can select either f/8
or f/4 . If a shorter recycling time is preferable , use f/4 . If
greater depth of fi eld is desired, use f/8
.