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Flash shooting distance for the built-
in
Speed light changes according to
the film speed
in
use and aperture setting .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
. . . . . . . . .
ISO
film
speed
25
50
100 200
400 800
Flash
shooting
distance
range
Guide
number
m/ft. 6120 8.5
/2
8
12
140 17/
56
24/79 34/
112
m/ft.
- -
1.4 2 2.8 4
2-8.5/6.6-28
-
1.4 2
2.
8 4 5.6
1.4-6
14.
6-20
1.4 2 2.8 4 5.6 8
1-4.2/3.3-14
Aperture
value
2
2.8 4 5.6
8
11
0.7-3/2.3-10
2.
8 4 5.6 8
11
16
0.6-2.1/2.0-6.9
4
5.6 8
11
16 22
0.
6-1
.5/2.0-4.9
5.6 8
11
16 22 32
0.
6-1
.1/2.0-3.6
8
11
16 22 32
- 0.6-0.8/2.0-2.6
• The
ma
ximum flash shooting distance can also be calculated by dividing the
guide number by the selected aperture value.
Example: When
f/2.8 is selected with ISO 100 film using the camera's built-in
Speedlight, the maximum flash shooting distance will be:
12
/2.8 = approx. 4.2m or
40
/2.8 = approx. 14 ft.
84