This formula does not apply to bounce
flashes, e.g. when the reflector is folded
down!
Example:
The speed of the loaded film is ISO 100 and the lens
has a focal length of 50 mm. The guide number
given for this combination in the table in the Adden-
dum is 34. Set on the camera or lens the aperture
f/4, for example. The above formula can now be
used to calculate the maximum flash range:
guide number 34
Maximum flash range = ------------------------ = 8.5 m
aperture 4
For the manual flash mode “M” at full light output
this means that the distance to the subject should
be 8.5 m to obtain correct exposure results.
For TTL flash mode this means that 8.5 m should
be the maximum distance to the subject. However,
to give the camera’s electronic system sufficient
scope for light output control the subject should be
positioned somewhere between 40% and 60% of
the calculated range. For the above example this
means a distance of between 3.4 m and 5.1 m.
For close-ups it is necessary to ensure that a mini-
mum distance of 10 % of the calculated value is
observed in order to avoid overexposure. For the
above example the minimum distance is 10% of
8.5 m = 0.85 m.
Please note that the maximum flash range
is related to subjects with a 25% reflectivity
which applies to most shooting situations.
Pronounced deviations from this reflectivity,
e.g. highly or poorly reflective subjects, can
influence the maximum flash range of the
mecablitz.
5.6 LC display illumination
Keep the “Mode” or “Zoom” key depressed for
approx. 10 sec. to activate the mecablitz LC dis-
play illumination. The LC display illumination is
switched off when a flash is triggered.
The settings on the mecablitz are not
changed when the above keys are pressed
for the first time!
If the shot was correctly exposed in TTL flash
mode, then the LC display illumination will be
activated during “o.k.” display (see 4.4).
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mecablitz and camera functions
Funzioni del mecablitz e della camera
mecablitz y funciones de la cámara
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