In photography and cinematography, a normal lens is a lens that reproduces a field of view that appears "natural" to a human observer. In contrast, depth...

wide-angle lens is a lens covering a large angle of view. Conversely, its focal length is substantially smaller than that of a normal lens for a given...

A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body...

shot from close using a wide-angle lens (with an angle of view wider than a normal lens). Objects close to the lens appear abnormally large relative to...

photography in lower light, and a shallower depth of field. A normal lens or "normal prime" is a lens with a focal length about equal to the diagonal size of...

Large format lenses are photographic optics that provide an image circle large enough to cover the large format film or plates used in large format cameras...

visible light are also called "lenses", such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses. Lenses are used in various imaging...

opposed to a fixed-focal-length (FFL) lens (prime lens). A true zoom lens or optical zoom lens is a type of parfocal lens, one that maintains focus when its...

An ultra wide-angle lens is a lens whose focal length is shorter than that of an average wide-angle lens, providing an even wider view. The term denotes...

length lenses are used. A long-focus lens is one of three basic photographic lens types classified by relative focal length, the other two being a normal lens...

a typical "normal" lens has a 50 mm focal length. A lens with a focal length shorter than normal is often referred to as a wide-angle lens (typically...

cheaper than the multi-lens design. Aspheric elements are used in the design of multi-element wide-angle and fast normal lenses to reduce aberrations....

A pancake lens is a colloquial term for a flat, thin camera lens assembly (short barrel). The majority are prime lenses of a normal or slightly wider...

between 84° and 64° Normal, or Standard lenses (36–60 mm in 35 mm film format) cover between 62° and 40° Long focus lenses (any lens with a focal length...

The design of photographic lenses for use in still or cine cameras is intended to produce a lens that yields the most acceptable rendition of the subject...

An Intraocular lens (IOL) is a lens implanted in the eye usually as part of a treatment for cataracts or for correcting other vision problems such as short...

Gauss lens is a compound lens used mostly in camera lenses that reduces optical aberrations over a large focal plane. The earliest double Gauss lens, patented...

50 mm lenses. This Double-Gauss lens replaces the 50mm f/1.8 (non-D). A 50 mm prime lens is the normal lens for the 135 film format. This lens was introduced...

after, and the only lens made for new mounts were the standard types. The Start, Zenit-7 and Zenit-D utilized the same normal lens — a Helios-44 2/58....

crystalline lens from its normal location. A partial dislocation of a lens is termed lens subluxation or subluxated lens; a complete dislocation of a lens is termed...

disadvantages compared to the competition at launch; there were no fast normal lenses, and neither of the two viewfinders (an eye-level pentaprism or folding...

Lens speed is the maximum aperture diameter, or minimum f-number, of a photographic lens. A lens with a larger than average maximum aperture (that is,...

A telecentric lens is a special optical lens (often an objective lens or a camera lens) that has its entrance or exit pupil, or both, at infinity. The...

ammunition (0.50 inches: see .50 BMG) In millimetres, the focal length of the normal lens in 35 mm photography The percentage (50%) equivalent to one half, so...

no-compromise designs which Zeiss refers to as the "best in the world" in the normal lens and short telephoto categories. They cover the 35 mm format. Otus APO-Distagon...

Wide-angle lens: angle of view wider than 60° and focal length shorter than a normal lens. Long focus lens: angle of view narrower than a normal lens. This...

lenses, progressive addition lenses (PAL), varifocal lenses, progressive power lenses, graduated prescription lenses, or progressive spectacle lenses...

expressed as the angular size of the view cone, as an angle of view. For a normal lens focused at infinity, the diagonal (or horizontal or vertical) field of...

A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors:...

The lens, or crystalline lens, is a transparent biconvex structure in most land vertebrate eyes. Relatively long, thin fiber cells make up the majority...