Guide number – Nikon Autofocus Speedlight SB-22 User Manual
Page 43
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Guide Number
In M or MD mode, without referring to the aperture se-
lection/shooting distance range panel, you can de
termine the f/stop by using the following equation:
,,
guide number
f/stop =--------------------------------- -—
flash-to-subject distance
See the table for guide numbers at various film
speeds.
Guide number at various film speeds
Unit; m (ft)
Normal
With wide-flash
adapter
Mode
selector
M (manual)
MD
M (manual)
MD
1600 100(328)
32(105) 70(230)
22 (72)
800
70(230)
22 (72) 50(164)
16(52)
o
400
50(164)
16(52) 35(115)
11 (36)
200
36(118)
11 (36) 25 (82)
8(26)
too
25 (82)
8(26)
18(59)
5.6(18)
50
18(59)
5,6(18)12.5(41)
4(13)
25
12.5(41)
4(13)
9(30)
2.8 (9)