Metz MECABLITZ 54 AF-1 Minolta - Manual (Page 57)

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4.1.2 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 over exposure, respectively.
To offset this effect a correction value can be set on some cameras to manual-
ly match the TTL flash exposure with 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 settings!
A dark subject in front of a bright background: Positive correction
value (approx. 1 to 2 f-stops). Light subject in front of a dark back-
ground: Negative correction value (approx. 1 to 2 f-stops). Correction
value settings can change the maximum flash range indicated on the
LC display of the flash unit and match it to the given correction value
(depends upon the camera model)!
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 cor-
rection back to the normal value on the camera!
4.1.3 Correct exposure indication in TTL flash mode (Fig. 4)
„o.k.“ correct exposure confirmation only appears on the LC display of the
flash unit if the shot was correctly exposed in TTL flash mode!
If „o.k.“ is not displayed after the exposure, then this means that the shot was
underexposed. The shot will then have to be repeated with the next smaller f-num-
ber (e.g. f/8 instead of f/11) or the flash-to-subject distance or reflecting surface
must be reduced (e.g. with bounce flash). Please note the maximum flash range
indicated on the LC display of the flash unit (see 5.4.1).
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Also see section 5.3 for the display of exposure symbols in the ca-
mera’s viewfinder.
4.2 Multi-zone flash exposure metering (preflash metering)
For system-induced reasons only possible with Minolta Dimage 5,
Dimage 7 and 7i! Multi-zone flash exposure metering (preflash me-
tering) is a modern variant of TTL flash operation. The cameras do not
permit standard TTL flash operation without preflash.
When the camera’s shutter release is pressed for picture shooting a preflash
is fired to measure the subject’s reflection. With the aid of its exposure system
and the 14-segment honeycomb pattern multi-zone metering, the camera’s
electronics captures the light reflected by the subject and determines the opti-
mal weighting for the 4 segments of flash exposure metering on the basis of
the measured light distribution and the information given by the AF system.
The subsequent main flash and the consequent exposure are performed ac-
cording to the results obtained by preflash metering.
The flash unit must be set to TTL mode. Multi-zone flash exposure metering is
not specifically set or displayed on the flash unit. For the setting procedure of
multi-zone flash metering on the camera and other details please refer to the
camera manual.
4.3 ADI flash control (Advanced Distance Integration)
For system-induced reasons, only possible with Dimage 5, 7 and 7i!
ADI flash control is a modern variant of TTL flash operation. The ca-
meras do not permit standard TTL flash operation without preflash.
ADI flash control is a multi-zone flash metering system (preflash metering)
expanded by additional guide number control.
The flash unit must be set to TTL mode. ADI flash control is not specifically
displayed on the flash unit. Please refer to the camera manual for the setting
procedure of ADI flash control and other details.
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54 AF-1 M 03.08.2004 10:53 Uhr Seite 57