Nikon SB 27 Instruction Manual - Page 40

If the ready-light blinks after shooting - guide number

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If the ready-light blinks after shooting The ready-lights in the SB-27 and the camera blink for approx. 3 seconds after shooting to signal that the flash has fired at full output but the light may have TTL A M mm ZOOM M ISO ft m 60 18 30 9 15 4 72 41 2 0.6 been insufficient. -When using the SB-27 with cameras in Group I, the underexposure indicator ÷ blinks in the SB-27's LCD panel and the amount of underexposure is indicated. Reshooting • Reconfirm flash-to-subject distance and flash shooting distance range when shooting in programmed auto (P) or shutter-priority auto (S) exposure mode, or choose aperture-priority auto (A) or manual (M) exposure mode. Select an aperture that will allow you to bring the subject within flash shooting distance range. Flash shooting distance range in 1/300 TTL High-Speed Sync Flash operation (F5 only) Flash shooting distance range (far side) cannot be read from the indicator bars on the SB-27 in AUTO flash mode. In such a case, use the following "Guide number" table and equation for calculating the shooting distance according to each zoom-head position. Guide number (at ISO 100 for m/ft) Zoom head position 24mm 28mm 35mm 50mm Guide number 11/36 12/39 14/46 16/52 D (flash shooting distance) = Guide number 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 (far side) [measured in meters] You can read a shooting distance (near side) of 0.6m from the SB-27's indicator bars. Therefore, the flash shooting distance ranges from 0.6m to 2.5m. For films other than ISO 100, multiply the figures in the table above by the factors shown below. ISO film speed 25 50 200 400 800 Factor x0.5 x0.71 x1.4 x2 x2.8 

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If the ready-light blinks after shooting
40
The ready-lights in the SB-27
and the camera blink for approx.
3 seconds after shooting to
signal that the flash has fired at
full output but the light may have
been insufficient.
—When using the SB-27 with cameras in
Group I, the underexposure indicator
÷
blinks in the SB-27's LCD panel
and the amount of underexposure is indicated.
TTL
A
M
M
ZOOM
ISO
mm
ft
m
60
30
15
7
4
2
18
9
4
2
1
0.6
Reshooting
• Reconfirm flash-to-subject distance and flash shooting distance
range when shooting in programmed auto (P) or shutter-priority auto
(S) exposure mode, or choose aperture-priority auto (A) or manual
(M) exposure mode. Select an aperture
that will allow you to bring
the subject within flash shooting distance range.
Flash shooting distance range in 1/300 TTL High-Speed Sync
Flash operation (F5 only)
Flash shooting distance range (far side) cannot be read from the
indicator bars on the SB-27 in AUTO flash mode.
In such a case, use the following “Guide number” table and equation
for calculating the shooting distance according to each zoom-head
position.
Guide number (at ISO 100 for m/ft)
Zoom head position
24mm
28mm
35mm
50mm
Guide number
11/36
12/39
14/46
16/52
Guide number
D (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 (far side) [measured in meters]
You can read a shooting distance (near side) of 0.6m from the SB-27’s
indicator bars. Therefore, the flash shooting distance ranges from
0.6m to 2.5m.
For films other than ISO 100, multiply the figures in the table above by
the factors shown below.
ISO film speed
25
50
200
400
800
Factor
x0.5
x0.71
x1.4
x2
x2.8