Fujifilm EF-42 Owner's Manual Page 23

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EN-10
ENGLISH
Manual Flash Photography
Manual ash control is una ected by re ections, making it the ideal
choice for pictures of highly re ective or unre ective subjects.
1
Turn the camera and  ash on.
2
Choose from the (APS-C) or (35 mm) focal
length format displays.
3
Adjust exposure compensation. Choose higher values to increase
ash output, lower values to decrease.
4
Adjust zoom. Note that if is selected, the  ash not light the
entire subject if zoom less than the focal length of the lens.
5
Adjust ash output by choosing a power ratio (PR) and con rm
that appears in the display.
6
Settings are complete when the red backlight turns o and the
icon for the selected setting stops blinking. Wait for the ready
lamp to light before taking photographs.
E ective Range
The e ective shooting range of the  ash in meters can be calculated
by multiplying the guide number by the sensitivity (ISO) coe cient
and dividing by the aperture (for feet, multiply the result by 3.28).
Flash range = guide number×ISO coefficient÷aperture (f-number)
The guide number varies with  ash output and lens focal length.
Focal length in mm (35mm format/APS-C)
Focal length in mm (35mm format/APS-C)
24/16
24/16
28/19
28/19
35/24
35/24
50/34
50/34
70/48
70/48
85/58
85/58
105/70
105/70
Power
Power
ratio
ratio
/
/
27 30 32 35 38 40 42
/
/
19 21 23 25 27 28 30
/
/
14 15 16 18 19 20 21
/
/
10 11 11 12 13 14 15
/
/

 7889101011
/
/

 5566777
/
/

 3444555
The ISO coe cient is shown in the table below.
ISO 100
ISO 100
ISO 200
ISO 200
ISO 400
ISO 400
ISO 800
ISO 800
ISO 1600
ISO 1600
ISO 3200
ISO 3200
11.422.845.7
For example, the range for a power ratio of 
/
 and a focal length of
35mm, an aperture of f/4, and a sensitivity of ISO 400 is 10 (the guide
number)× 2 (the ISO coe cient)÷ 4 (the aperture), or in other words
5m (16.4ft.).
R The bar graph in the  ash unit display shows the range at which optimal
exposure will be achieved; distances over 32m (105 ft.) are shown by .
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