Controls in detail —continued, Example – Nikon SPEEDLIGHT SB-16 User Manual
Page 42
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CONTROLS IN DETAIL —continued
Now, you are ready to read the usable f/stop from the
dial. Each color-coded line indicating the auto shooting
range for each f/stop has a notch on it. Find the notch
directly above the flash-to-subject distance and read
the f-number at the end of the line.
Example
With ASA/ISO 100, zoom head set at N for 35 mm lens,
a subject 2m (6.6 ft.) away, the aperture is approx, f/4.
With a subject 4m (13 ft.) away, the aperture is f/2.
Without referring to the exposure calculator dial, you can
also determine the f/stop by using the guide number
equation found on page 30.
The guide number at various film speeds and zoom head
settings is shown in the following table:
Guide numbers in the MD mode
Unit: m (ft)
Zoom head
setting
ASA/ISO film speed
800
400
200
100
50
25
T
30 (98) 21 (69)
14 (46)
10 (33) 7 (23)
5 (16)
s
27 (89) 19 (62)
13 (43)
9.5 (31) 6.7 (22)
4.7(15)
N
22 (72) 16 (52)
11 (36) 8 (26)
5.6(18)
4 (13)
Wi
19(62)
13 (43) 9.5 (31) 6.7 (22) 4.8(16)
3.3(11)
12(39)
8.4 (28) 5.9(19)
4.2(14)
3 (9.8)
2.1 (6.9)
* IV
2
is used when the wide-flash adapter is attached to the flash unit
with the zoom head set at W t.
32