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You notice the deeper you go, the lower the visibility. The darker the
light conditions are, the higher the ISO. This makes your camera more
sensitive to light and will serve to compensate for the absorption of
light at depth.
Exposure Value (EV) also allows you to increase, or decrease, the
camera’s light sensitivity. Increase EV to brighten images, and decrease
EV to darken pictures. You may choose to increase the EV setting
depending on depth, visibility or ambient light.
NOTE: The color of your object will effect the brightness of your subject
and the selection of your ISO or EV may be effected. Check you camera
instructions for more information about ISO and EV
Depth Visibility Light EV
15-30 feet (5-10m) 20+ ft. (6m +) bright, sunny -2
30-60 feet (10-20m) 10-20 ft. (3-6m) medium, cloudy -1
60-90 feet (20-30m) 0-10 ft. (0-3m) dark, night 0
