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,...

photographic lens for which the focus is not adjustable is called a fixed-focus lens or sometimes focus-free. The focus is set at the time of lens design,...

nickname Speed, Indiana Speed, Kansas Speed, Missouri Speed, North Carolina Speed, West Virginia Speed, Victoria, Australia Speed River, Canada Speed (ride)...

reducer, or more recently a "speed booster", a genericised trademark that refers to the Metabones Speed Booster line of lens adapters. This type of adapter...

In film and photography, a prime lens is a fixed focal length photographic lens (as opposed to a zoom lens), typically with a maximum aperture from f2...

aperture of an optical system (including a system consisted of a single lens) is a hole or an opening that primarily limits light propagated through the...

measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system's focal length by the diameter of...

increase lens speed, and in some instances improve optical transfer function (OTF) performance. It is also widely known under the name “Speed Booster”...

easy to focus the lens of a fast reflex camera when it is opened to wider apertures (such as in low light or while using low-speed film). Most SLR cameras...

A twin-lens reflex camera (TLR) is a type of camera with two objective lenses of the same focal length. One of the lenses is the photographic objective...

Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over...

TGV network, with high speed trains to Paris. It is served by the Lens-Béthune bus network, with bus services running across Lens and connecting it to nearby...

gravitational lensing is described by Albert Einstein's general theory of relativity. If light is treated as corpuscles travelling at the speed of light,...

Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35mm format single-lens reflex cameras. The F-mount was first introduced...

second will let half as much light in as 1⁄250. The camera's shutter speed, the lens's aperture or f-stop, and the scene's luminance together determine the...

Olympus 35mm rangefinder camera with a wide-angle lens was the Wide-S (or Wide Super) of 1957. Lens speed was increased by almost two stops compared to the...

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...

A telephoto lens, also known as telelens, is a specific type of a long-focus lens used in photography and cinematography, in which the physical length...

format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Because the image sensors in many digital...

An explosive lens—as used, for example, in nuclear weapons—is a highly specialized shaped charge. In general, it is a device composed of several explosive...

close or at great distances. f/8 allows sufficient depth of field and lens speed for good, clear exposure in most daylight situations. The expression,...

A Luneburg lens (original German Lüneburg lens) is a spherically symmetric gradient-index lens. A typical Luneburg lens's refractive index n decreases...

Google Lens is an image recognition technology developed by Google, designed to bring up relevant information related to objects it identifies using visual...

the use of camera movements that change the orientation or position of the lens with respect to the film or image sensor on cameras. Sometimes the term is...

A lens flare happens when light is scattered, or flared, in a lens system, often in response to a bright light, producing a sometimes undesirable artifact...

digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that combines the optics and mechanisms of a single-lens reflex camera with...

camera shake is a particular problem at slow shutter speeds or with long focal length lenses (telephoto or zoom). With video cameras, camera shake causes...

move lens elements or the image sensor itself to counteract camera shake, especially beneficial in low-light conditions or at slow shutter speeds. Lens hoods...

focal plane shutter, the Speed Graphic can also use lenses that do not have shutters (known as barrel lenses). Using a Speed Graphic, especially with...

A fisheye lens is an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image.: 145  Fisheye...