Aperture refers to the lens diaphragm on a camera that controls the amount of light that touches the film when the shutter opens. Settings for an aperture opening are measured in f-numbers, also known as the F-Stop. F-numbers are calculated by dividing the length of the lens’ diameter by the focal length. Aperture settings are generally located or adjusted on the outer edge of a camera’s lens.
Larger aperture settings, ranging from around f3.0 to f5.5, allow more light to enter through the lens. Consequently, if a photographer sets his aperture to a higher number, a single object will become the photo’s central feature, significantly minimizing any figures in the pictures background. Larger apertures are commonly used for portraits or close-ups.
Alternatively, smaller apertures, ranging from f16 to f32, include more figures in the foreground, as well as the background. In such pictures, more elements are clearly defined than a single central object. As a result, photos taken with narrower apertures lend more perspective to a scene. Landscapes and cityscapes are the usual subjects of pictures taken with smaller apertures.
If a photographer is taking a picture that doesn’t require an extreme close-up nor a broad scope, an aperture setting from f8 to about f11 tends to yield well-defined images.
American Standards Association (ASA) ASA, an acronym for American Standards Association, refers to an antiquated scale for film speeds devised by Kodak during the 1940s. Film speed measures the degree to which film is ...