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Flash shooting distance for the
built-
in Speed light changes according to
the film speed in use and aperture setting .
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ISO film speed
25
50
100
200
400
800
Flash shooting
distance range
Guide number
m/ft.
6120
8.5/2
8 12140 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
1.4-614.6-20
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
maxi
mum 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
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