User's Manual

17
10. Care and Maintenance
Remove dust and grime with a soft dry cloth, or a silicon-treated cloth. Do not use detergents as
these may damage the plastic parts.
Forming the flash capacitor
The flash capacitor incorporated in the flashgun undergoes a physical change when the flash-
gun is not switched on for prolonged periods. For this reason it is necessary to switch on the
flashgun for approx. 10 minutes every 3 months. The battery must supply sufficient power to
light up the flash-ready light within one minute after the flashgun was switched on.
9. Exposure Corrections
The automatic exposure systems are based on a subject reflection factor of 25%, this being the
average reflection factor for subjects shot with flash.
Dark backgrounds absorb a lot of light, while bright backgrounds reflect a great deal of light
(e.g. backlit scenes), thereby resulting in subject overexposure or underexposure, respectively.
9.1 Exposure correction in automatic flash mode
To compensate the above mentioned effect, the exposure can be corrected by opening or
stopping down the camera’s aperture. With a bright background the sensor of the flashgun
cuts out the flash too soon with the result that the actual subject is too dark. With a dark back-
ground the flash is cut out too late so that the actual subject is too bright.
Bright background:
Open the camera aperture by 1/2 to 1 f-stop
(e.g. from f/5.6 to f/4).
Dark background:
Close the aperture by 1/2 to 1 f-stop
(e.g. from f/8 to f/11).
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