mixed light photos
In small depths, the daylight is enough, in order to expose the film correctly. But the colors
disappears, beginning with red, to yellow, etc. Flashes are only necessary to receive
colours with increasing depth. The substantial on mixture light photographs is an easy
underexposure, related to the ambient brightness.
Example:
Exposure indicator on the camera, measured horizontal in the water : F 8
Aperture adjustment on the camera in A- or M - mode : 11 or 11/16
Thus the flash must brighten up a flashed object around approximately 1 to 2 apertures,
the colour of the water is in this case deep blue.
You can use the manual powersteps also for mixed light photos.
automatic TTL mode on digital cameras
The flash works only with integrated or external digital converter
(f. e. HeinrichsWeikamp) in TTL- mode with digital cameras.
In the opposite to analogical cameras digital cameras are not identified
automatically by the flash electronic, because of the different interfaces from
the camera brands.
for correct function a digital converter is absolutely necessary.
Depends on the underwater housing manufacturer or model, the converter is already
integrated to the camera housing. Please ask therefore your the manufacturer or your
local dealer.
operation with external converter
Connect the digital converter (as written in the manual) between the camera-housing and
the flash. Turn the function mode switch in
“Auto”
position.
In this mode the flash is fully controlled by the connected camera system. (see also
analogical TTL- mode )
Note: there is a permanent data transfer between the camera and the flash.
operation with integrated converter
Connect the synchronous cable to the camera housing.
Be sure, that all needed pins are connected between the hotshoe and the plug outside the
housing. ( Nikon needs 5 wires, Canon need 6 wires for TTL)
Basics to digital TTL
:
Your camera needs for the ttl–mode one or more short preflashes. The reflected light on
the sensor is the basement for the calculation of the main flash.
The precision of this calculation depends on the speed of the camera, the quality of the
system, the function-mode you use. Please read the manual of the camera for more
informations.
Note : never use the red eye flash mode
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