Long-focal-length lens

Long-focal-length lens (telephoto lens). A lens that provides a narrow angle of view of a scene, including less of a scene than a lens of normal focal length and therefore magnifying objects in the image. Lossless. See Compression, lossless.

Using a long-focal-length lens Focusing on near objects APERTURE The aperture, or f/stop as it is commonly called, is used to regulate the diameter of the lens opening. That controls the luminance on the film plane.

Telephoto and other long-focal-length lenses are best known for making distant objects appear magnified. This effect is similar to moving closer to the object, but is not the same, since perspective is a function solely of viewing location.

Whereas most long-focal-length lenses for DSLRs tend to have fairly long closest focusing distances, the S100FS can focus down to 90cm at the long end of the zoom and 10cm at wide angle.

LiOn Lithium ion battery Long-focal-length lens (telephoto lens) A lens that provides a narrow angle of view of a scene, including less of a scene than a lens of normal focal length and therefore magnifying objects in the image.

See also: Camera, Focal, Back, Subject, Photograph