For manual (m) operation, Controls in detail —continued – Nikon SPEEDLIGHT SB-16 User Manual
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CONTROLS IN DETAIL —continued
For manual (M) operation
After setting the ASA/ISO film speed and zoom setting
knob on the exposure calculator dial, focus on the sub
ject: then look at the lens and read off the focused dis
tance to determine exactly how tar away the subject
actually is. Now, find the end of the color-coded line
directly above the flash-to-subject distance and read off
the f-number next to this line. Then, set this aperture on
your lens.
Example
When using ASA/ISO 100 (with the zoom head set at N
for a 35mm lens) and the subject Is located 1.5m (5.0 ft.)
away, the correct aperture is approx, f/22. With a subject
3m (10 ft.) away, the aperture is approx, f/11.
Without referring to the exposure calculator dial, you can
also determine the f/stop by using the following equation:
f/stop =
guide number
flash-to-subject distance
30
With ASA/ISO 100 film and meters (and the zoom head
set at N for a 35mm lens), the SB-16’s guide number Is
32. It the subject Is 4 m away, divide 32 by 4 to get
f/8. With ASA/ISO 25 film and feet (and zoom head set at
N for a 35mm lens), the guide number is 52. Therefore,
if the subject is 20 ft. away, divide 52 by 20 to get approx.
f/2.8.