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5.7.4 Manual TTL flash exposure correction
The TTL auto flash mode of most cameras is matched to a 25
% degree of light reflection by the subject (average amount of
light reflected by flash-shot subjects). Consequently, a dark
background that absorbs a great deal of light, or a bright
background that reflects a great deal of light, can result in
under- or overexposure, respectively.
To offset this effect a correction value can be set on some
cameras to manually match the TTL flash exposure to the
photographic situation. The actual extent of correction
depends on the contrast prevailing between subject and
background. The correction value is set on the camera.
Please refer to the camera’s operating instructions for details
concerning the settings.
A dark subject in front of a bright background:
Positive correction value (approx. 1 to 2 EV). Light
subject in front of a dark background: Negative cor-
rection value (approx. -1 to -2 EV).
Exposure correction by changing the lens diaphragm is not
possible because the camera’s automatic exposure system
will automatically regard the changed diaphragm as the
normal working aperture.
After the exposure do not forget to reset the TTL flash
exposure correction back to the normal value on the
camera!
5.8 Establishing the maximum flash range with the
aperture calculator
Only possible on flash units with aperture calculator.
The maximum flash range of the mecablitz can be estab-
lished by way of the aperture calculator in the control
panel.
• Set the “ISO” upper slide at the ISO speed of the film
loaded in the camera.
• Set the lower slide at the selected zoom position of the
reflector (28 mm, 35 mm, 50 mm or 85 mm).
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705 47 0076.A2 36 AF3-4 13.07.2006 15:10 Uhr Seite 83
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