Manual Metz MECABLITZ 34 AF-3 Pentax (page 27 of 108) (English, German, Dutch, French, Italian, Spanish)

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5. TTL ﬂash control

The mecablitz receives its information exclusively

from the connected TTL-controlled AF-camera.

Exposure measurement in TTL mode (TTL =

through-the-lens) is completed by the camera’s

sensor. This sensor measures the light reaching

the ﬁlm through the camera lens. An electronic

control circuit within the camera transmits a stop

signal to the ﬂashgun as soon as the ﬁlm has been

exposed by the correct amount of light; the ﬂash is

then instantly cut out.

The advantage of the TTL mode is that all factors

inﬂuencing the exposure of the ﬁlm (such as ﬁl-

ters, change of aperture or variable aperture

zooms) are taken into account. You need not worry

about adjustment of the light output. The camera’s

electronic system automatically deﬁnes the requi-

red amount of light. You can also utilize various

metering facilities

(e.g. spot , matrix or centre-

weighted overall readings)

offered by some came-

ras.

The table on page 33 gives the maximum range

for the selected aperture. The minimum lighting

distance is approx. 15% of the maximum thres-

hold range.

If the actual distance is shorter than the

minimum lighting distance, then this may

result in overexposure.

The speed of ﬁlms to be exposed under

TTL ﬂash control must be between ISO

25/15°* and ISO 1000/31°. Correct expo-

sures cannot be guaranteed with other

ﬁlm speeds.

A strip of ﬁlm must be loaded in the camera if tests

are to be conducted in TTL ﬂash mode. The effec-

tive ﬂash range can only be checked by the cor-

rect-exposure display (o.k.) if the ﬂash is triggered

by the camera and not with the manual release on

the ﬂashgun!

With automatic ﬁlm speed setting (DX): ISO 32/16°

798 47 0049-A1 34 AF-3 P 27.05.2008 16:43 Uhr Seite 27

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Metz MECABLITZ 34 AF-3 Pentax Manual

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