When talking about photography, exposure refers to the amount of light which reaches the film or sensor of your photography camera. Thus, it determines how dark or light an image will appear when capturing a photograph. Exposure is determined by three camera settings known as the “exposure triangle”. These are-ISO, aperture and shutter speed. Controlling your camera exposure basically involves selecting a specific combination of these three. Getting the right exposure is a flexible process you can manage largely without the aid of a photo studio. Compare it to riding a bike-until you learn how to balance, you are more likely to crash than get anywhere! Exposure Triangle
- ISO: We’ll deal with ISO ( stands for the International Organization of Standardization) first as it is an interesting one. It is not technically a part of exposure as it does not affect the amount of light reaching your camera’s sensor (the definition of exposure). It alters the photography lighting in-camera after taking the photograph, artificially altering the exposure of your image. It is apparent when a photographer relies too much on ISO. When you increase the ISO on your camera, your photos will be brighter, but will also emphasize noise (the graininess of an image) and distort your image. The lowest ISO on your camera, also known as the base ISO, is the normal sensitivity of your camera’s lens. Typically, this is ISO 100, but it varies with numbers ranging from 64 to 200. The maximum ISO is commonly ISO 1600, but it can be higher.
- Aperture: This refers to an adjustable opening that controls the amount of light that is allowed to pass through the camera lens and hit the camera sensor. You can think of it as your own eyes! How far you open your eyelids controls how much light is entering your eyes and reaching your eye, influencing what you can see.
- Shutter speed: The shutters are the two curtains in front of your camera sensor that stay closed until your camera fires. When your camera fires, these shutters snap open so that light can reach the camera sensor. After your camera sensor collects light for a set time, the shutters will close immediately, cutting off the light source. Shutter speed is the set time that the shutters stay open. This affects your image in two important ways.