Nikon SB 20 Instruction Manual page 31

3
To read proper shooting
• distance, set distance
scale selector to letter shown
in zoom indicator window.
TN W T-.....
POWER
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4.
Choose and set aperture.
The aperture index w indow shows usable ape rtures. For example, with
film speed index set at ISO 100 and the zoom set ring at N, and if you want
to shoot a subject 3m away, you can select any apertu re from 112 to f/8.
You can also determ ine apertu re using the SB-20's guide number (GN ).
For details, see page 32.
With Nikon F-401 / N4004, use camera's aperture dial.
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