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14. Special functions
Fig. 24: Exposure o.k.
The correct exposure indicator („o.k.“)
ᕩ
lights up only when the frame will be,
or was, correctly exposed in the auto and TTL mode.
In this manner it is possible to manually trigger a test flash while in auto mode so
that the correct aperture can be established beforehand. This is particularly
valuable with bounced flash when reflection conditions are difficult to judge.
1 The test flash is triggered with the manual firing button
ተ
(fig. 24).
If the exposure o.k. indicator
ᕩ
remains dark after the test flash was fired, then
adjust the next larger aperture (smaller f-number) or diminish the distance to the
reflection surface or subject, and repeat the test flash.
The f-stop established in this manner must also be set on the camera.
To trigger a test flash, hold the camera and flashgun in the same
manner as for the actual shot.
This facility can also be used with TTL mode without having to produce test expo-
sures. The flashgun is adjusted to auto mode, and the correct aperture is then
determined with a test flash in the previously described manner.The established
aperture is transferred to the camera, and the flashgun is then readjusted to TTL
mode.
This procedure is relatively accurate with lenses of medium focal length of between
28 mm and 85 mm. But in borderline cases underexposure may occur with
subsequent TTL exposure.
Exposure o.k.
46
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14. Special functions
Fig.25: The AF measuring beam
In such an event the exposure o.k. display
ᕩ
remains dark after the shutter has
been released. Select the next larger f-stop (e.g. f/8 instead of f/11), and repeat
the exposure.
AF measuring beam
As the release or other sensory control of the camera is operated, the integrated
AF measuring beam
ᕧ
is automatically activated in the event of low lighting
levels or with a low-contrast subject. The measuring beams project a light
pattern onto the subject (Fig. 25). The camera’s autofocus system uses the light
reflected from the subject to measure image sharpness and focus the lens. The
range of the AF measuring beam
ᕧ
is approx. 9 m with a 50 mm f/1.7 lens.
This function is only available with specific AF cameras in conjunction
with an SCA 3000 adapter.
AF measuring beam
☞