is defined as the process or art of producing images of objects on sensitized surfaces by the chemical action of light or other forms of radiant energy. Underwater Photography

Determined by the focal length of the lens, the angle of view is the area of a particular scene that a lens covers, or, what the lens can “see”. See different lens types below. The angle of view is measure in horizontal and vertical degrees.

The opening of the lens through which light passes through. Aperture is measured in f-stops. The smaller the number, the larger the lens opening, and the larger the number, the smaller the opening and the less light allowed to reach the sensor. Aperture also controls depth of field, a smaller aperture (larger number) will produce maximum image shar [..]

The distance between the nearest and furthest objects that appear acceptably sharp in a given photograph. Or, in other words, the range of sharp focus beyond and in front of the main object the camera is focused on. It is common in underwater photography that macro images are shot with a small depth of field and wide angle images with a large one.

The amount of light allowed to reach the sensor, in the case of digital cameras. The amount, or intensity of the light reaching the sensor is manipulated by the lens opening, and the duration of time that the light is able to strike the sensor is controlled by shutter speed.

A number representing all available combinations of aperture and shutter speed resulting in the same exposure (with scene brightness remaining the same). The EV +/- setting on the camera is used to make the image more or less exposed in automatic modes (ones that the camera calculates the Aperture and shutter speed). It is common in ambient light u [..]

Measured in millimeters, focal length is the distance between the sensor and the optical center of the lens, when focused on infinity. The focal length is usually marked on the lens itself, sometimes with a range (example: 55mm-250mm). For more on focal length, see the section on lenses.

Also called photomacrography, this is the process of taking pictures of very small objects at 1x reproduction ratios or greater. Macro photography is perhaps the most common type of photography underwater. The existence of so many tiny creates in unique shapes and impressive colors has made this form of photography very popular. Due to the close pr [..]

The process of removing undesirable white colorcasts. Digital cameras are not as good as the human eye at judging what is white under different light conditions when using Auto White Balance modes. If pictures are coming out with a blue, yellow, or green cast, the camera is having difficulty adjusting the white balance, which is relative to the “co [..]

This is a mode where the user sets the aperture and the camera decides the shutter speed. User controls depth of field, while the camera makes a smart, corresponding choice for shutter speed based on the user’s decision. This is a common mode to shoot at underwater without an external strobe and using the EV +/- to determine the exposure of the ima [..]