Flash Range - Rollei AFM 35 Operating Instructions Manual

FLASH RANGE

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.
24
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
Guide number 15.5
Flash range = =
F-stop 5.6
Any change in subject distance has to be accompanied
by a change in the aperture chosen.
= 2.7 m