Photography: Exposure Triangle

Exposure is uncovering –here it is the uncovering the image sensor to light.

Exposure is the amount of light that is allowed to reach the camera sensor.

Exposure is the brightness of an image.

According to the degree of exposure we call an image

underexposed (less light)

overexposed (more light)

Exposure in photography is determined by

how much of time the image sensor is kept open (Shutter speed)

how much of light is allowed to hit the image sensor (Aperture)

and how sensitive is the image sensor to light (ISO).

The task is to get optimal exposure. How do we achieve optimal exposure?

Study the PDF below (for academic use only)

Photography: Exposure Triangle PDF

ISO is the sensitivity of the image sensor towards light while picture is taken. The unit of measurement is 'numbers'. Lesser the ISO number, lesser the sensitivity of the image sensor to light. Therefore less brightness.

Shutter speed is the duration of time the shutter is kept open when a picture is taken. The unit of measurement is 'seconds'. Slower the shutter speed, more time the shutter is kept open. Therefore more light.

The primary function of shutter speed is to capture objects in motion. to capture faster moving objects one must use faster shutter speeds.

Aperture is the size of the opening of the diaphragm of the lens while picture is taken. The unit of measurement is 'f stops', meaning 'f/the value one adds'. F stands for focal length. so it is focal length divided by the aperture number you add. Smaller the aperture number (this means larger aperture), bigger size of the opening of the diaphragm. Therefore more light.

The primary function of aperture is to create depth of field. Smaller the aperture number (this means larger aperture) narrower or shallower the depth of field.

For which of this one gives importance while taking a picture depends on what is the priority of the photographer.

Exposure Triangle

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