Metz MECABLITZ 20 C-2 Mode D'emploi page 69

• Set the flash unit's main switch to position
«2.8» or «5.6».
• The sensor must be pointing at the subject
irrespective of the reflector setting. It only
measures the light during the firing of flashes
by the flash.
Two colour-coded auto working apertures
(green – red) are available, depending on the
given ISO film speed. The auto working aper-
ture is selected with the main switch (green -
red) on the flash and depends on the camera-
to-subject distance.
On the aperture calculator at the rear of the
flash unit, you can read off the f-stop at the
right, the ISO sensitivity at the left, and, above,
the corresponding maximum flash range.
Example: Aperture f5.6 / ISO 100 = maxi-
mum flash range 3.6 m
A minimum distance to the subject should be
maintained to avoid overexposure. The mini-
mum distance is approx. 10 % of the maxi-
mum flash range.
Ideally, the subject should be located in
the middle third of the zone between the
minimum distance and the maximum
flash range to give the electronic circuit
sufficient leeway for light control.
Example:
You are using an ISO 100 film and a 50 mm lens.
k
69