94
k
5.1.3 TTL flash mode with measurement pre-flash
(Olympus)
The TTL flash mode with measuring preflash is a further
development of the standard TTL flash mode of analo-
gue cameras.
Depending on the camera model, the preflashes precede
the main flash by such a short interval that they
practically cannot be distinguished from the main flash!
The preflashes do not contribute to the lighting of the
shot.
5.1.4 P-TTL flash mode (Pentax)
The P-TTL flash mode is a digital TTL flash mode that is a
further development of the TTL flash mode of analogue
cameras.
5.1.5 Preflash TTL and ADI metering (Sony)
Preflash TTL and ADI metering are digital TTL flash
operating modes and refined versions of the TTL flash
operation found in analogue cameras.
In the case of ADI metering, additional distance data
from the lens is incorporated into the flash exposure
process. The selection and/or setting of the preflash
TTL and ADI metering operating modes are carried out
on the camera (see camera operating instructions).
5.1.6 TTL flash mode with measurement pre-flash
(FUJIFILM)
The TTL flash mode with measuring preflash is a further
development of the standard TTL flash mode of analo-
gue cameras.
5.2 Automatic Fill-in flash mode
The automatic fill-in flash mode is activated by most
cameras when the automatic programme P is selected
and by Vari or subject programmes during daylight
(see camera operating manual).
Fill-in flash mode overcomes troublesome shadows and
produces a more balanced exposure between subject
and background with contre-jour shots. The camera’s
computer-controlled metering system sets the most
suitable combination of shutter speed, aperture and
flash output.
Ensure that the contre-jour light source does not shine
directly into the lens, as this will interfere with the
camera’s TTL metering system!
There is no setting or display for automatic fill-in flash in
the flash unit.
