45
Detailed operation
ISO
25
50
100
200
400
800
1600
Factors
x0.5
x0.71
x1
x1.4
x2
x2.8
x4
To calculate the correct aperture
n
Calculate the correct aperture by using this equation and the guide number
table, according to the ISO sensitivity and flash output level that are set:
f/stop (aperture) = Guide number (GN) x ISO sensitivity factor ÷ Shooting distance (m/ft)
n
Set the same aperture on both the SB-80DX and the camera or lens.
To calculate the guide number
n
Calculate the guide number by using this equation, according to the shooting
distance and aperture required.
Guide number (GN) = Shooting distance (m/ft) x Aperture x ISO sensitivity factor
n
Referring to the guide number table, determine an appropriate flash output
level corresponding to the guide number obtained above, then set the same
value on the SB-80DX.
ISO sensitivity factors
n
For sensitivity other than ISO 100, multiply the guide number at an ISO
sensitivity of 100 by the factors shown in the guide number table.
*
1
With the Diffusion Dome attached and the built-in wide-flash adapter in place
*
2
With the Diffusion Dome attached
*
3
With the built-in wide-flash adapter in place
Zoom-head position (mm)
∗
1
∗
2
14
∗
3
17
∗
3
24
28 35
50
70 85 105
M1/1
12.5/41 16/52
17/56
19/62
32/105
34/112
38/125
44/144
50/164
53/174
56/184
M1/2
8.8/29 11.3/37
12/39
13.4/44 22.6/74
24/79
26.8/88
31/102
35/115 37.5/123 40/131
M1/4
6.3/21
8.0/26
8.5/28
9.5/31
16/52
17/56
19/62
22/72
25/82
26.5/87
28/92
M1/8
4.4/14
5.6/18
6.0/20
6.7/22
11.3/37
12/39
13.4/44 15.5/51 17.7/58
18.7/61
19.8/65
M1/16
3.1/10
4.0/13
4.3/14
4.8/16
8.0/26
8.5/28
9.5/31
11/36
12.5/41
13.3/44
14/46
M1/32
2.2/7
2.8/9
3.0/10
3.4/11
5.6/18
6.0/20
6.7/22
7.8/26
8.8/29
9.4/31
9.9/32
M1/64
1.6/5
2.0/7
2.1/7
2.4/8
4.0/13
4.3/14
4.8/16
5.5/18
6.3/21
6.6/22
7.0/23
M1/128
1.1/4
1.4/5
1.5/5
1.7/6
2.8/9
3.0/10
3.4/11
3.9/13
4.4/14
4.7/15
4.9/16
FP
-
-
-
-
10.7 /35 11.3/37 12.7/42 14.7/48 16.7/55
17.7/58
18.7/61
Guide number (ISO 100, m/ft)
Flash
output
level
Содержание autofocus speedlight SB-80DX
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