
24
Flash range
Flash range varies as a function of film speed and – in
aperture-priority AE – of the f-stop selected. The
following ranges apply to programmed AE:
ISO film speed
Flash range
50/18
°
0.4 – 3.0 m
100/21
°
0.4 – 4.2 m
200/24
°
0.5 – 6.0 m
400/27
°
0.7 – 8.5 m
800/30
°
1.0 – 12.0 m
1600/33
°
1.4 – 17.0 m
Note:
The above ranges apply to color reversal (slide) film.
Due to its greater exposure latitude, color negative film
gives wider ranges.
FLASH RANGE
Flash range for aperture-priority AE can be determined
by dividing the guide number by the f-stop used. The
following guide numbers apply to different film speeds:
ISO film speed
Guide number
50/18
°
5.5
100/21
°
11
200/24
°
15.5
400/27
°
22
800/30
°
31
1600/33
°
44
Example:
Film speed: ISO 200/24
°
Guide number: 15.5
F-stop chosen: f/5.6
Flash range =
Guide number
=
15.5
= 2.7 m
F-stop 5.6
Any change in subject distance has to be accompanied
by a change in the aperture chosen.
Содержание AFM 35
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Страница 47: ...47 LENS CROSS SECTION ...
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