Nikon SPEEDLIGHT SB-16 - Manual (Page 29)

control of the flash exposure at any aperture from f/2 to
f/22 to match the camera-to-subject distance: the farther
away the subject, the more light emitted by the flash
unit; the closer the subject, the less light given off.
Because the exposure is measured through the lens, no
exposure compensation is required in off-camera and/or
bounce-flash operation or even with a teleconverter or
filter attached to the lens.
This setting is also used for programmed TTL auto opera­
tion with F-501/N2020 and F-301/N2000.
A (non-TTL automatic operation)
In the non-TTL automatic (A) mode, the light output of the
flash varies automatically to match the flash-to-subject
distance, but instead of the light being measured through
the lens, it is read by the light sensor on the front of the
SB-16. At any film speed setting, you have a choice of
two working apertures indicated by the blue A1 and
orange A2 aperture indicator lines on the bottom of the
exposure calculator dial.
M (manual operation)
At the manual'('M) setting, the SB-16 fires at its maximum
light output regardless of the flash-to-subject distance.
When it is difficult to obtain correct exposure on auto, i.e.,
when the brightness of the background affects exposure
strongly, use the SB-16 on manual. In the manual mode,
exposure should be determined with the exposure cal­
culator dial or with the guide number equation found on
page 30.
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