Subal ND7100, Руководство пользователя

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The front glass of the ports are to be cleaned carefully to avoid scratches. If possible, rinse well in
freshwater, let it dip off and dry with a soft cloth carefully.
Dried lime/salt spots are very hard to
remove!
Faint scratches are filled in by the water and stay invisible but with greater damage, it may be
necessary to replace the front glass.
The fogging of the front glasses can be avoided by inserting Silicagel or by applying an antifogging
liquid.
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 curvation radius of the dome.
A dioptre lens on the camera lens restores the full focusing range under water. The needed 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!