T7 Exposure

An artist paints with pigment where as the photographer “paints” with light!

Hence, the amount of light entering the camera affects the quality of the image formed on the film or sensor.

There are three ways where the photographer may control the amount of light:

  • The aperture – the size of the opening control the amount of light entering the camera. The bigger the aperture opening, more light entering the film/sensor, the brighter the image(s).

Diagram 1   Aperture Range and the size of the opening.
(Image source: pixeltut.com)

Diagram 2   Aperture range and its effect
(Image source: photography.tutsplus.com)

  • The shutter – the speed of the curtain that permits light fall on the film or sensor control the duration of light exposing the film or sensor to light. The longer the exposure, the brighter (more exposed) the image shall be and vice verse.

Diagram 3   Shutter speed and its effect.
(Image source: photography.tutsplus.com)

Diagram 4   Shutter speed and its effect on the exposure level.
(Image source: nobadfoto.com)

  • The ISO – The speed or sensitivity of the film or sensor being exposed to form image(s) within the given duration. More sensitive film (higher ISO) let the image form more speedily when the light is dim.

Diagram 5   ISO scale and the sensitivity level towards lighting condition
(Image source: themagicinpixels.com)

Diagram 6   ISO scale and its effect.
(Image source: photography.tutsplus.com)

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