Olympus FL-50 - Manual (Page 11)

ISO speed
AUTO light control range (m)
F8 F5.6 F4 F2.8 F2 F1.4
F11 F8 F5.6 F4 F2.8 F2 F1.4
F16 F11 F8 F5.6 F4 F2.8 F2 F1.4
F22 F16 F11 F8 F5.6 F4 F2.8 F2
F32 F22 F16 F11 F8 F5.6 F4 F2.8
F32 F22 F16 F11 F8 F5.6 F4
F32 F22 F16 F11 F8 F5.6
F32 F22 F16 F11 F8
F32 F22 F16 F11
1.1 - 12.8 1.2 - 14.2 1.7 - 20.0 1.9 - 21.4 2.2 - 25.7 2.5 - 28.5 2.8 - 32.1 3.1 - 35.7
0.8 - 9.0 0.9 - 10.0 1.2 - 14.0 1.3 - 15.0 1.6 - 18.0 1.7 - 20.0 2.0 - 22.5 2.2 - 25.0
0.5 - 6.4 0.6 - 7.1 0.8 - 10.0 0.9 - 10.7 1.1 - 12.8 1.2 - 14.2 1.4 - 16.0 1.5 - 17.8
0.5 - 4.5 0.5 - 5.0 0.6 - 7.0 0.6 - 7.5 0.8 - 9.0 0.8 - 10.0 1.0 - 11.2 1.1 - 12.5
0.5 - 3.2 0.5 - 3.5 0.5 - 5.0 0.5 - 5.3 0.5 - 6.4 0.6 - 7.1 0.7 - 8.0 0.7 - 8.9
0.5 - 2.2 0.5 - 2.5 0.5 - 3.5 0.5 - 3.7 0.5 - 4.5 0.5 - 5.0 0.5 - 5.6 0.5 - 6.2
0.5 - 1.6 0.5 - 1.8 0.5 - 2.5 0.5 - 2.7 0.5 - 3.2 0.5 - 3.6 0.5 - 4.0 0.5 - 4.5
0.5 - 1.1 0.5 - 1.2 0.5 - 1.7 0.5 - 1.8 0.5 - 2.2 0.5 - 2.5 0.5 - 2.8 0.5 - 3.1
0.5 - 0.7 0.5 - 0.8 0.5 - 1.2 0.5 - 1.3 0.5 - 1.5 0.5 - 1.7 0.5 - 1.9 0.5 - 2.2
3200 1600 800 400 200 100 50 25
8 (W panel) 10 (W panel) 12 14 17 25 35 42
16 (W panel) 20 (W panel) 24 28 35 50 70 85
Firing angle (mm) Upper row: FOUR THIRDS. Lower row: 135
Lens ir
is
<MANUAL>
In this mode, the flash is emitted according to the guide number (GN) setting.
<AUTO>
In this mode, the flash light intensity is controlled automatically according to the lens iris (F) setting.
ISO speed
Lens iris (F)
1. Turn dial A to adjust the ISO speed.
2. Adjust Zoom according to the focal length of the lens.
3. Turn dial B according to the lens iris (F).
If the camera setup (ISO speed and lens iris (F)) does not
match one of the usable ISO speed/lens iris (F) combina-
tions, the ISO and F indicators blink to alert you. In this
case, change the camera setup (ISO speed and/or lens
iris (F)).
Memo: Test flash activation
Flash activation can be tested before actually releasing
the shutter.
Press the Test button for test flash activation.
The light control is OK when the AUTO CHECK lamp blinks
for about 5 seconds after the test flash activation.
If the lamp does not blink, change the lens iris (F), ISO
speed, subject distance, etc.
• The light check by means of test flash activation is pos-
sible only in the AUTO mode.
Guide number (GN)
Light intensity ratio
1. The control panel shows the current guide number (GN)
together with the light intensity ratio.
Light intensity ratio: Ratio of emitted light intensity with
respect to the intensity at full emission.
2. Adjust Zoom according to the focal length of the lens.
3. Turn dial A to set the guide number (GN).
(This is also possible by turning dial B.)
How to determine the lens iris (F) and guide number (GN)
1. When the shooting distance and lens iris are already
determined:
Determine the guide number (GN) with the following
formula and set the GN on the FL-50.
Guide number (GN) =
Light control range in AUTO mode
The above table shows the light control ranges in the off-flash condition.
The displayed nearer value is 0.6 or more when the light emission section faces the front and 0.5
or more when it faces downward.
4. When flash activation has been performed correctly,
the AUTO CHECK lamp blinks for about 5 seconds
after the shutter is released.
Lens iris (F) x Shooting distance (m)
ISO speed coefficient
2. When it is necessary to determine the lens iris (F):
Determine the lens iris (F) with the following formula and
set F on the FL-50.
Lens iris (F) =
Guide number (GN) x ISO speed coefficient
Shooting distance (m)
3. When it is necessary to determine the optimum shooting
distance:
=
Guide number (GN) x ISO speed coefficient
ISO speeds and their coefficients
ISO speed 25 50 100 200 400 800 1600 3200
Coefficient 0.5 0.71 1.0 1.4 2.0 2.8 4.0 5.6
See page 64 for the guide number list.
Memo: By selecting an ISO speed and lens iris (F) different from those
set on the camera, the light intensity can be adjusted in 1/3 steps.
Optimum shooting
distance (m)
Lens iris (F)