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Underwater photographers will probably want to set the flash
mode to the flash always setting to insure they always have a
flash with every exposure. It is also wise to set the focus mode
to allow the lens to focus in the macro range for capturing great
images of the tiny and exotic subjects that you can find underwater.
Checking the Gasket:
Prior to each closure of the housing the gasket seal should be
visually inspected. If there is any debris present, including dirt,
sand, dust, hair, grease or other matter, it must be cleaned to
insure a proper watertight seal. Cleaning the gasket is a simple
matter of wiping it with a damp, soft cloth to remove the foreign
matter. Be careful the cloth you use does not leave any of its own
material behind as this can also affect the effectiveness of the
gasket. It is not necessary to remove the gasket for cleaning unless
visual inspection determines that there is foreign matter underneath
the gasket as well. If this occurs, be sure the surface of the housing
is also clean and wiped free of any debris.
Since the gasket on the Fantasea FL-3 and FL-4 are face-
to-face/compression sealed, and is not subject to friction
as it is closed, there is no need to lubricate it. Grease or
any other form of lubrication does not help seal the
housing. It only reduces friction, which is commonly
present if the housing has an O-ring seal. Lubricating the
gasket before use could cause it to slip out of its groove,
and not form a proper seal: therefore no silicon or other
lubricants should be used.
The gasket should also be checked visually for any cracks
or perforations. If any part of the gasket shows signs of
wear or damage, it is imperative that it be changed before
going into the water.
If the gasket is removed from the channel groove it sits
in, be sure to get it completely back into place so it is
properly seated. Starting at one corner, press the gasket
with your finger and feel it seat into its channel groove.
Then continue this procedure continuously in one direction,
round its perimeter, until the entire gasket has been
pressed flat into place. Go over it a second time to be sure
it is properly in place. Then you are ready to clean it, give
it a final visual inspection, and close the housing.
Info:
Gasket
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