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Guide Number
See
the table
at
right for guide numbers of the film
speeds and zoom settings.
In
M mode,
use
the following equation
to
determine
aperture:
guide number
flstop
= -
-:::.-------
flash-to-subject distance
With
ISO
400 film
and
the zoom set knob
at
N,
the
S8-20's guide number
is
60(m) for full output. If the
subject
is
15m
away,
divide
60
by
15
to
get f/4.
32
Light output
Zoom
setting
W
Full
N
T
w
1/2 N
T
w
1/4
N
T
w
1/8
N
T
w
1/16
N
T
1600
800
88 62
(289) (203)
120 85
(394)
(279)
144
102
(472) (335)
62
44
(203)
(144)
85
60
(279) (197)
102 72
(335) (236)
44
31
(144) (102)
60 42
(197)
(138)
72
51
(236)
(167)
31
22
(102)
(72)
42 30
(138) (98)
51
36
(167) (118)
22
15
(72)
(49)
30
21
(98) (69)
36 25
(118) (82)
Unit·
m(
ft)
ISO film speed
400
200
100
50
25
44
31
22
15
11
(144)
(1U2)
(72) (49)
(36)
60
42
30
21
15
(197) (138) (98) (69) (49)
72
51
36 25
18
(236) (167) (118) (82)
(59)
31
22
15
11
7.8
(102) (72)
(49)
(36) (25)
42
30
21
15
11
(138) (98) (69) (49) (36)
51
36 25
18
13
(167) (118) (82) (59) (43)
22
15
11
7.8 5.5
(72)
(49) (36) (25) (18)
30
21
15
11
7.5
(98) (69) (49) (36) (25)
36 25
18
13
9
(118) (82) (59) (43) (30)
15
11
7.8 5.5 3.9
(49) (36) (25) (18) (13)
21
15
11
7.5
5.3
(69) (49) (36) (25)
(17)
25
18
13
9 6.3
(82)
(59)
(43)
(30)
(21)
11
7.8 5.5 3.9 2.7
(36) (25) (18) (13)
(88)
15
11
7.5 5.3 3.7
(49) (36) (25)
(17)
(12)
18
13
9 6.3
4.5
(59)
(43) (30) (21) (15)