Tips On Underwater Photography - Nikon NIKONOS-V Instruction Manual

TIPS ON UNDERWATER PHOTOGRAPHY-------,
The results you will obtain when shoot ing underwater Lens focal length and picture angle
depend upon the transparency of the water, the
shooting depth , whether or not objects are floating
near your subject , the condition of the light, and
several other factors. To take good underwater
photos, you must have a basic knowledge of under-
water photography.
Water's magnifying effects
Lig ht is refracted in water, so underwater objects
seem approximately 25% larger and closer than they
actually are. As a result , the picture angle of the lens
in use becomes smaller. For example, the picture
angle of a 35mm lens underwater is almost the same
as th at of a 50mm lens on land.
Illustrations, underwater photos, and editorial
supervision supplied
by
Akira Tateishi , Marine Art
Center, Co., Ltd.
58
Focal length (mm)
~
-
15 -
20
-
28 74°
35 62°
80
30°20'
4
1 Size of object as it appears underwater (4/3U
2 Actual size of object
(U
3 Actual or measured distance (j)
4 Distance set on lens (3/41)
5 Your eye
6 Underwater mask
94°
78°
59°
46'30'
22' 45'