What is aperture definition?

Aperture is the size of the opening in the lens through which light passes into the camera body. It is measured in f-stops and represented by a numerical value, such as f/2.8 or f/8. The aperture controls the amount of light that enters the camera, as well as the depth of field of the resulting image.

A wide aperture, such as f/1.8 or f/2.8, allows more light to enter the camera and produces a shallow depth of field that can blur the background and emphasize the subject. A narrow aperture, such as f/11 or f/16, lets in less light and produces a greater depth of field that can keep the entire scene in focus.

Aperture also has an impact on the exposure of the image. A smaller aperture opening will let less light in, requiring a longer exposure time to create a properly exposed image. A larger aperture will generally require a faster shutter speed to balance the exposure.

The aperture can be adjusted manually on most cameras, or set to automatic mode where the camera will make adjustments based on the lighting conditions and other settings. Understanding how aperture works is essential for creating well-exposed and creatively composed images.