Digital Camera Angle and Perspective

A camera comprises at least a dark room, with one side open to bring the light emitted by the scene to photograph and the other a sensitive surface to record the light.

In the most common case, a target is positioned at the opening. Most often, it contains a diaphragm for metering the amount of light entering, and the depth of field (both of which are related). Some targets (simple models for amateurs or objectives retroreflecting) use fixed openings.

There are some devices that do not target the pinhole. Only a tiny opening allows the formation of a relatively clear image, which prevents them from a large quantity of light and therefore leads to long exposure time. Hence the interest of the goal: to bring much more light (and get a clearer picture).

It also installs most of the time a valve to control the exposure time of the sensitive surface. Some old rooms to pass: the operator (the photographer) just remove the lens cap before the time of application - but this is true especially for long hauls, commonly used in the early days of photography, in agreement with slow emulsions then.

The surfaces used to carry two large families: the silver and digital. In the first case, using an emulsion of gelatin and silver salts coated on a glass plate or film, in the second sensor (the images are then recorded on an electronic device separate from the sensor, usually a memory card).