Exposure Triangle

Exposure Triangle

The Exposure triangle consists of 3 variables that determine exposure of either a photograph or video ; The Aperture, Shutter Speed, and ISO.

Lets talk about all three elements to better understand the need of these adjustments.

ISO Speed is how sensitive your camera’s sensor is to light, each value of the rating represents a “stop” of light, and each incremental ISO number (up or down) represents a doubling or halving of the sensor’s sensitivity to light. Here is an Example 

Aperture controls the lens’ diaphragm, which controls the amount of light traveling through the lens to the film plane. The aperture setting is indicated by the f-number, whereas each f-number represents a “stop” of light. Here is an Example 

Shutter Speed indicates the speed in which the curtain opens then closes. This is essentially how long light is permitted to hit your camera’s sensor once you hit the shutter-release button. Each shutter speed value also represents a “stop” of light. The shutter speed is measured in fractions of a second. Here is an Example 

Motion Blur through Shutter Speed : To Obtain a natural Motion Blur, the Shutter Speed must be twice the frame rate of the Camera. For Example, 24fps would require 1/50 SS.