4.3 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 sub-
jects shot with flash). Consequently, a dark back-
ground that absorbs a great deal of light, or a
bright background that reflects a great deal of
light, can result in under- or overexposure, re-
spectively.
To offset this effect a correction value can be set
on some cameras (see Table 1) to manually match
the TTL flash exposure (or D-TTL flash exposure on
digital SLR cameras) to the photographic situa-
tion. The actual extent of correction depends on
the contrast prevailing between subject and back-
ground!
A dark subject in front of a bright back-
ground: Positive correction value. Light sub-
ject in front of a dark background: Nega-
tive correction value. Correction value
settings can change the maximum flash
range indicated on the mecablitz LC display
and match it to the given correction value
(depends upon the camera model)!
Exposure correction by changing the lens dia-
phragm 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!
Setting correction values for the
mecablitz 44 AF-3N
Manual correction values for flash exposure are
always set on the camera. Please refer to Table 1
for the diverse camera types and to the setting
instructions given in the individual camera
manuals.
Setting correction values on the mecablitz
44 AF-4N when using cameras from
Group A of Table 1 (Fig. 13)
• Mount the mecablitz on the camera.
• Switch on the mecablitz and the camera.
• Lightly touch the camera’s shutter release to
induce a data exchange between the flash unit
and the camera.
☞
☞
Flash techniques
Tecniche lampo
Técnicas de destello
28
EV
Fig. 13 / Grabado 13
1
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