Zoom Lenses

Some articles on lenses, zoom lenses, zoom:

Camera Lens - Types of Lens - Zoom
... Some lenses, called zoom lenses, have a focal length that varies as internal elements are moved, typically by rotating the barrel or pressing a button which activates an electric motor ... Commonly, the lens may zoom from moderate wide-angle, through normal, to moderate telephoto or from normal to extreme telephoto ... The zoom range is limited by manufacturing constraints the ideal of a lens of large maximum aperture which will zoom from extreme wideangle to ...
Depth Of Field - DOF Formulas - Practical Complications
... The distance scales on most medium- and small-format lenses indicate distance from the camera’s image plane ... Moreover, for many zoom lenses and internal-focusing non-zoom lenses, the location of the front nodal plane, as well as focal length, changes with ... is not specified for medium- and small-format lenses ...
Lenses For SLR And DSLR Cameras - Types of Lenses - Zoom Lenses
... The focal length of a zoom lens is not fixed instead it can be varied between a specified minimum and maximum value ... is such that the loss of image quality in zoom lenses (relative to non-zoom lenses) is minimal, and zoom lenses have become the standard lenses for SLRs and DSLRs ... still relied primarily on standard non-zoom lenses ...
Photographic Lens Design - Types of Lenses
... Prime lens - a photographic lens whose focal length is fixed, as opposed to a zoom lens, or it is the primary lens in a combination lens system ... The problem posed by the design of wide angle lenses is to bring to an accurate focus light from a wide area without causing internal flare ... Wide angle lenses therefore tend to have more elements than a normal lens to help refract the light sufficiently and still minimise aberrations whilst adding ...
Canon EF 28-70mm Lens
... The Canon EF 28-70mm f/2.8L is an EF mount wide-to-normal zoom lens made by Canon from 1993 to 2002 ... Among zoom lenses, it is known for excellent contrast, color rendition and sharpness, and it is widely considered to be one of the finest wide-to-normal ... Like many other zoom lenses, it exhibits some barrel distortion at the wide end of its range ...

Famous quotes containing the word lenses:

    Life is a train of moods like a string of beads, and, as we pass through them, they prove to be many-colored lenses which paint the world their own hue, and each shows only what lies in its focus.
    Ralph Waldo Emerson (1803–1882)