Directed Electronics D800 Uživatelský manuál Strana 12

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DOMEPORTS
Domeports are ports with a curved front glass. They are mainly used with wide angle lenses to keep
the same angle of coverage under water as on land.
When using domeports for wide angle lenses, please note the following:
Dome glasses act in water like lenses, creating an apparent image of the actual subject, which is
smaller and closer than in reality. The lens must be focused on this virtual image. The required
adjustment of the lens is in the region of 0.15 to 0.3 m, depending on the curvature radius
of the
dome. A dioptre lens on the camera lens restores the full focusing range under water. The required
power of the dioptre lens depends on the lens type and the type of the domeport. Without these
correcting lenses you may not even be able to get your subject in focus!
The fogging of the front glasses can be avoided by inserting Silicagel or by applying an antifogging
liquid.
CHANGING A LENS
SUBAL ND800 allows changing the lens without camera removal.
Unlock the Port Lock ( if fitted )
Remove the frontport.
Turn the lens release knob clockwise approx. one quarter turn and push it down to release the lens
lock mechanism.
Hold it in position and turn the lens clockwise to remove it.
Leave the lens release knob, put the new lens onto the camera and attach the proper port.
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