Underwater Photography Judging Distance Underwater.
Parallaxing and refraction Underwater is the biggest problem is to
determine an estimated distance to establish the setting on the lens
where a subject matter will be a sharp and chirsp image. In establishing
a composition structure of taking picture, most key subjects will be at 2.5
feet to 4 feet of seen distance from the camera. However the refraction
will result in a measured distance of 25% greater than perceived. This
means learning to judge distance is very important for the settings, not a
measurement.