FOCAL LENGTH Meaning and
Definition
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Focal length is a term used in optics and photography to define the distance between the lens and the image sensor or film plane when the subject is in focus. It is a fundamental component in determining the field of view, magnification, and image perspective of a lens.
In lenses, focal length is measured in millimeters (mm) and is usually categorized into three groups: wide-angle, normal, and telephoto. Wide-angle lenses have a shorter focal length, providing a wider field of view, whereas telephoto lenses have a longer focal length, resulting in a narrower field of view and magnification.
The focal length directly affects the imaging characteristics of a lens. A shorter focal length leads to a wider field of view, allowing for capturing a broader scene. Conversely, a longer focal length narrows the angle of view, resulting in a closer, magnified image of the subject.
Focal length also influences image perspective. A shorter focal length enhances the perception of depth and creates a wider perspective, making objects appear farther apart. On the other hand, a longer focal length compresses the perspective, bringing distant objects closer and making scenes appear more compressed.
Understanding the concept of focal length is crucial for photographers as it helps them choose the appropriate lens for specific shooting scenarios, such as landscape, portrait, or wildlife photography, based on the desired field of view and magnification.
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Etymology of FOCAL LENGTH
The word "focal length" comes from the Latin word "focus", meaning "hearth" or "fireplace", which later developed into "a point of convergence". The term was originally used in optics to refer to the point at which light rays converge after passing through a lens. The concept of focal length was first introduced by Pierre de Fermat, a French mathematician, and physicist, in the 17th century. Over time, the term "focal length" became the standard way to describe the distance between a lens and its focal point.
Similar spelling word for FOCAL LENGTH
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