Metz MECABLITZ 20 C-2 - Manual (Page 74)

(average reflection factor for subjects shot with
flash). A dark background that absorbs a great
deal of light or, alternatively a light background
that reflects a great deal of light (e.g. backlit
scenes), would invariably result in over- and
underexposure of the subject.
Exposure correction in auto flash mode
To compensate the above effect the exposure
can be corrected by opening or stopping
down the camera’s aperture. With a predomi-
nantly light background the sensor of the flash
unit will interrupt the flash prematurely with the
result that the subject is underexposed.
Alternatively, with a dark background the flash
will be cut off too late. The subject will be over-
exposed.
Light background
Open the camera aperture
by 1/2 to 1 f-stop (from f/5.6 to f/4)
Dark background
Stop down the camera aperture
by 1/2 to 1 f-stop (e.g. from f/5.6 to f/8)
7.3 Bounce flash
Photos shot with full frontal flash are easily
recognized by their harsh, dense shadows.
This is often associated with a sharp drop in
light from the foreground to the background.
This phenomenon can be avoided with bounce
flash because the diffused light will produce a
soft and uniform rendition of both the subject
and the background. For this situation the
74
k
705 47 0068.A1 31.01.2006 13:45 Uhr Seite 74