Understanding the Exposure Triangle
The exposure triangle is a fundamental concept every photographer or videographer should understand. It refers to the three main camera settings that control the exposure of a photo - aperture, shutter speed, and ISO. By balancing these three settings, you can achieve proper exposure and capture the scene as you envision it.
- Aperture is the size of the opening in the lens that allows light to pass through to the camera sensor. It is measured in f-stops like f/2.8, f/5.6, f/11, etc. A wider aperture (lower f-number like f/2.8) lets in more light and produces a shallower depth of field. A narrower aperture (higher f-number like f/11) lets in less light but provides a deeper depth of field.
- Shutter speed is the length of time the camera shutter remains open to expose the sensor to light. It is typically measured in fractions of a second, like 1/250, 1/60, 1/2, etc. A faster shutter speed freezes motion but lets in less light. A slower shutter speed allows more light in but can introduce motion blur if the subject or camera moves.
- ISO is the camera sensor or film sensitivity to light. A lower ISO number like 100 is less sensitive, producing the cleanest images. Higher ISO numbers like 3200 are more sensitive, allowing you to shoot in lower light, but introduce more digital noise (film grain if shooting film) into the image.
http://www.andersenimages.com/tutorials/exposure-simulator/
Graphics obtained from Petapixel.com
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