Exposure: what is it?

Angelina Vivcharenko
Angelina Vivcharenko
December 1, 2014
Exposure: what is it?

Many photographers who are just beginning to get acquainted with the terms and definitions of this field of art, are wondering what is the exhibition.

Exposure - is the amount of light that falls on the film for a certain period of time. It depends on three main parameters: sensitivity, shutter speed and aperture.

Aperture, shutter speed, sensitivity

With the help of the diaphragm is regulated by the size of the hole through which light passes. The wider the hole, the more light. The aperture value decreases with increasing diameter.

Exposure - luminous flux time. It is short (for example, 1/2000 sec.) And long (for example, 15 sec.).

The value of the photosensitivity of the film (ISO) characterizes its ability to perceive light. ISO more than 400 - short exposure of the element, low ISO (less than 100) - long exposure at a constant aperture.

Formula for calculating the exposure

There is a convenient form to calculate the exposure value. She looks like this:

Exposure = film illuminance (aperture) * time of exposure to light (exposure).

This formula is useful for beginners, its application does not require deep expert knowledge in the field of photography.

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