Nikon Autofocus Speedlight SB-22 Instruction Manual page 24

2. Align film speed in use
'with the fiim speed index.
Note: Lines between the numbers on
the film speed scale represent inter­
mediate settings. (See illustration.)
32
40'
64
25
80
50
125
.
' "100
160
200
250
400
320
^ y-
500'^r
640'^- 16oa
1000
'
1250
'
Ifl
3_ Seiect and set aperture.
The aperture scale window shows usable apertures. (Depending on
film speed in use, all usable apertures may not be shown in the aperture
scale window; for usable apertures, see table on page 20.)
For example, with the film speed index at ISO 100, you can select any
aperture from f/2 to f/22. Selecting f/4 lets you take pictures of subjects
0.8m to 6.2m (approx. 2.6ft. to 30ft.) away.