Metz MECABLITZ 20 C-2 - Manual (Page 72)

6.2.3 Manual flash mode with guide number
calculation
The aperture to be set on the camera can also
be calculated by the following formula:
guide number
Aperture = —————————————
flash-to-subject distance
The guide numbers for the individual film
speeds are listed in the Guide Number Table
at the end of the “Technical Data” section.
The flash-to-subject distance is the camera-to-
subject distance.
Example:
You are using an ISO 100 film and a 50 mm lens.
The camera-to-subject distance is approx. 3 m.
Refer to the Guide Number Table and select
GN 20.
Calculate: Aperture = 20 ÷ 3 = 6,66
Set f/5,6 on the camera or camera lens.
7. Flash techniques
7.1 Fill-in flash in daylight
The flash can also be used for fill-in flash in
daylight in order to eliminate dense shadows
and produce a more balanced illumination in
contre-jour shots.
Fill-in flash in auto flash mode
Use the camera or a hand-held exposure
meter to establish the required aperture and
shutter speed for a normal exposure.
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705 47 0068.A1 31.01.2006 13:45 Uhr Seite 72