Metz MECABLITZ 36 C-2 - Manual (Page 106)

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Manual flash mode
Modo flash manuale
Funcionamiento manual del flash
Example:
You are using an ISO 100 film and a 50 mm lens. The
camera-to-subject distance is approx. 7 m.
The aperture calculator of the mecablitz indicates f/4 as the
required aperture. This f-number must be set on the camera
or camera lens.
7.2.3 Manual flash mode with guide number calculation
The aperture to be set on the camera can also be calculated
by the following formula:
Aperture = guide number ÷ 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.