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lens US English

A piece of glass or other transparent substance with curved sides for concentrating or dispersing light rays, used singly (as in a magnifying glass) or with other lenses (as in a telescope)

lens hood US English

A tube or ring attached to the front of a camera lens to prevent unwanted light from reaching the film

long lens US English

A lens with a long focal length, especially as a camera attachment for taking photographs from a great distance

twin-lens US English

(Of a camera) having two identical sets of lenses, either for taking stereoscopic pictures, or with one forming an image for viewing and the other an image to be photographed (twin-lens reflex)

zoom lens US English

A lens allowing a camera to change smoothly from a long shot to a close-up or vice versa by varying the focal length

crown lens US English

A lens made of crown glass and usually forming one component of an achromatic lens

field lens US English

In a multiple lens optical system, the lens farthest from the eye

macro lens US English

A lens suitable for taking photographs unusually close to the subject

prime lens US English

A lens of fixed focal length

contact lens US English

A thin plastic lens placed directly on the surface of the eye to correct visual defects

electron lens US English

A device for focusing a stream of electrons by means of electric or magnetic fields

standard lens US English

A camera lens with a focal length approximately equal to the diagonal of the negative (taken as 50 mm for a 35 mm camera), giving a field of view similar to that of the naked eye

achromatic lens US English

A lens that transmits light without separating it into constituent colors

crystalline lens US English

The transparent elastic structure behind the iris by which light is focused onto the retina of the eye

gravitational lens US English

A region of space containing a massive object whose gravitational field distorts electromagnetic radiation passing through it in a similar way to a lens, sometimes producing a multiple image of a remote object

progressive lens US English

An eyeglass lens having a smooth transition between parts with different focal lengths, correcting for vision at all distances

single-lens reflex US English

Denoting a reflex camera in which the lens that forms the image on the film also provides the image in the viewfinder

fisheye US English

A wide-angle lens with a field of vision covering up to 180°, the scale being reduced toward the edges

fisheye lens in fisheye US English

A wide-angle lens with a field of vision covering up to 180°, the scale being reduced toward the edges

fresnel US English

A flat lens made of a number of concentric rings, to reduce spherical aberration

fresnel lens in fresnel US English

A flat lens made of a number of concentric rings, to reduce spherical aberration

objective lens in objective US English

The lens in a telescope or microscope nearest to the object observed

progressive lenses in progressive lens US English

An eyeglass lens having a smooth transition between parts with different focal lengths, correcting for vision at all distances

telephoto US English

A lens with a longer focal length than standard, giving a narrow field of view and a magnified image

telephoto lens in telephoto US English

A lens with a longer focal length than standard, giving a narrow field of view and a magnified image

Lens culinaris in lentil US English

The plant that yields lentils, native to the Mediterranean and Africa and grown also for fodder

twin-lens reflex in twin-lens US English

(Of a camera) having two identical sets of lenses, either for taking stereoscopic pictures, or with one forming an image for viewing and the other an image to be photographed (twin-lens reflex)


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