 underwater Photo Course :: (8) underwater Photo Subjects :: Wide Angle Subjects :: Fisheye lenses Underwater
Fisheye lenses Underwater
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Fisheye lenses are extreme wide-angle
lenses that have focal lengths between 6mm and 16mm, and give an
incredible angle of view of 180 degrees on the diagonal! Consequently, fisheye
lenses have all the advantages already mentioned for wide-angle lenses - only
more so! Some give a full format rectangular image, others only a circular area
in center frame.
 Unfortunately, Fisheye lenses are not available for compacts. They are therefore limited to housed
cameras
Fisheye lenses bend straight lines to a great extent,
especially at the edges of the frame, but this is not a disadvantage in most
underwater applications.
 If you want to photograph wrecks seriously you must have a fisheye, which also means you must have a housed SLR.
Because everything seems so small in the frame with Fisheye lenses they also
make the visibility seem twice as good as it actually is! The downside with
using fisheyes is that you have to be careful not to get your own fins in the
shot!
 Dome shades are not much use with fisheye lenses because of Vignettingcropping of the corners of the frame. If unintentional it is due to a misaligned lens or port.!
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