16
USING THE FLASH
The Coolpix has a built-in flash, which will illuminate nearby underwater subjects. For subjects that are
farther away, an accessory slave flash is recommended (See Below). A built-in flash diffuser is supplied
which will help achieve a wider and softer light source thereby providing more coverage and less likelihood
of
backscatter (
the unattractive snowstorm affect of the flash reflecting off the suspended particles in the
water). Further reduction of
backscatter
can be achieved by using an accessory off-camera slave flash. This
will be discussed in more detail.
The need for artificial light to maximize color reproduction is necessary in nearly all pictures. Therefore it is
strongly recommended that you set the flash mode to
Flash Always
. This will insure the flash fires on every
exposure regardless of the ambient light conditions (Please refer to the camera's
instruction manual for more
details).
Outdoor photographers do not have this same concern. There is no backscatter to be concerned with, and due
to the ability of the flash to travel farther and more effectively in air as compared to in water, there is
normally not a need for an accessory flash to provide proper illumination for most subjects.
ACCESSORY SLAVE FLASH
If you use the Coolpix built-in flash as the master, you can trigger a second
slave
flash to provide more
artificial light when needed. To do this, you must use an accessory flash that has a
slave
feature built in. The
flash from the Coolpix must be aimed or bounced toward the accessory flash's
slave
sensor, or other fiber
optic sensor. This will trigger the slave to fire in sync with the master flash.
When using an accessory slave flash with fiber optic cable, it is recommended to black out the internal
camera flash. The internal flash is located near the camera lens and can contribute to backscatter by
illuminating floating particles close to the lens port.
If the sensor of the fiber optic cable is attached to the outside of the housing directly above the internal flash
and taped over with black tape–it will block out the light from the internal flash but transmit the light pulse to
the external slave flash
Note
Be sure to use a slave flash that has the ability to ignore the built-in pre-flash in
digital cameras, and synchronizes with the shutter release.
