Nikon FSA02911 Instruction Manual - Page 30

Flash shooting distance range in 1/300 TTL High-Speed, Flash sync operation F5 only

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TTL Auto Flash t Mode For cameras in Group I: F5 only Flash shooting distance range in 1/300 TTL High-Speed Flash sync operation (F5 only) In combination with the F5 camera, 1/300 High-Speed Flash Sync (with Custom Setting; 1/250 sec. at normal setting) is possible. But the farthest flash shooting distance cannot be read from the indicator bars _ on the SB-28 in TTL Auto Flash t Mode. In this case, use the guide number table and equation for calculating this distance according to each zoom-head position. Guide number (at ISO 100 for m/ft) Zoom head position 18mm 20mm 24mm 28mm 35mm 50mm 70mm 85mm  Guide number 8/26 8/26 11/36 12/39 14/46 16/53 18/59 19/62 D (farthest flash shooting distance) = --f/Gs-tuo-idpe-(an-pue-mrt-buer-er )- For example, when shooting with ISO 100 film, at a 35mm zoom-head position and an aperture of f/5.6: D = 14/5.6 = 2.5 (measured in meters) D = 46/5.6 = 8.2 (measured in feet) The farthest flash shooting distance is 2.5m (8.2ft). You can read the closest shooting distance from the SB-28's indicator bars _. • For film speeds other than ISO 100, multiply the figures in the table above by the factors shown below. ISO film speed Factor 25 x 0.5 50 x 0.71 200 x 1.4 400  x 2 800 x 2.8 30

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Flash shooting distance range in 1/300 TTL High-Speed
Flash sync operation (F5 only)
In combination with the F5 camera, 1/300 High-Speed Flash Sync (with
Custom Setting; 1/250 sec. at normal setting) is possible. But the farthest
flash shooting distance cannot be read from the indicator bars
_
on the
SB-28 in TTL Auto Flash
t
Mode.
In this case, use the guide number table and equation for calculating this
distance according to each zoom-head position.
Guide number
D (farthest flash shooting distance) = ——————————
f/stop (aperture)
For example, when shooting with ISO 100 film, at a 35mm zoom-head position and
an aperture of f/5.6:
D = 14/5.6 = 2.5 (measured in meters)
D = 46/5.6 = 8.2 (measured in feet)
The farthest flash shooting distance is 2.5m (8.2ft). You can read the closest
shooting distance from the SB-28’s indicator bars
_
.
• For film speeds other than ISO 100, multiply the figures in the table above by the
factors shown below.
30
TTL Auto Flash
t
Mode
Guide number (at ISO 100 for m/ft)
Zoom head position
Guide number
18mm
20mm
24mm
28mm
35mm
50mm
70mm
85mm
8/26
8/26
11/36
12/39
14/46
16/53
18/59
19/62
ISO film speed
Factor
25
50
200
400
800
x 0.5
x 0.71
x 1.4
x 2
x 2.8
For cameras in Group I: F5 only