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lens
A lens is a transparent optical device that focuses or diverges light, allowing it to pass through and form an image. Lenses are commonly used in optical systems, such as cameras, telescopes,...
lens barrel
The mechanical structure that holds a number of individual lens elements.
lens bench -> optical bench
A support for optical parts comprising a solid bed that permits precise longitudinal movement of one component relative to the others, and a number of sliders equipped with holders for lenses, lamps,...
lens blank
A lens blank is a piece of optical material in a raw, unfinished state, typically in the form of a disk or block, from which lenses are eventually fabricated. Lens blanks are made from various...
lens disc
A rotating disc that holds several lenses of differing focal length about a diameter. Used to switch lenses in a system while maintaining focus.
lens element
One optical element of a multielement lens. See optical element.
lens measure
A tool used to determine the curvature of a lens surface in terms of dioptric power. See lens watch; spherometer.
lens meridian
A line passing through the center of a lens surface, from edge to edge.
lens molding
The production of rough glass lens blanks that are pressed while red-hot to the approximate size and shape of the finished lens, ready for fine grinding and polishing. Large companies often do their...
lens mount
The metal tube that maintains the optical components of a lens in proper relationship. Some lenses are mounted in metal cells, which in turn are screwed to the front and rear of a shutter or lens...
lens speed
Also known as f number, lens speed is commonly represented as the ratio of the focal length to the diameter of the lens. Lower f numbers produce brighter images.
lens system
Two or more lenses arranged to act in conjunction with one another.
lens testing equipment
Lens testing equipment refers to a range of specialized tools and instruments used to evaluate the optical performance, quality, and characteristics of lenses. These instruments are essential for...
lens transmission
The ratio of the intensities of a light bundle before and after passing through the lens.
lens watch
A dial depth gauge graduated in diopters; a lens measure.
lensless Fourier transform hologram
A hologram formed without lenses and with the object and reference points sharing the same plane. In the initial recording, each object point produces fringes having one spatial frequency across the...
lensless microscopy
Lensless microscopy, also known as computational or holographic microscopy, is an imaging technique that captures and reconstructs microscopic images without the use of traditional lenses. Instead of...
lenslets
A matrix of miniature lenses, molded or formed onto a common base.
lensometer
An ophthalmic instrument used to measure the magnitude and direction of the maximum and minimum powers of a spectacle lens, and mark the optical center of the lens by an ink dot. When the lens to be...
absorption lens
An optical lens manufactured to control the transmission of light over a specified wavelength range. Low absorption lenses are produced which are anti-reflection coated for UV, VIS and IR wavelengths...
achromatic lens
A lens consisting of two or more elements, usually of crown and flint glass, that has been corrected for chromatic aberration with respect to two selected wavelengths. Also known as achromat.
anamorphic lens
A lens, usually having one or more cylindrical surfaces, used to produce distorted images and later to restore them to true form.
anamorphote lens
A lens that distorts an optical image.
aplanatic lens system
A system that satisfies the Abbe sine condition, and is free from spherical aberration and coma.
aspheric lens system
An optical system having one or more lens or mirror components that have nonspherical surfaces. These surfaces, whether reflecting or refracting, serve to advance or retard the incident wavefront,...
aspheric lens
An aspheric lens is a type of lens whose surface profiles deviate from the traditional spherical shape. Unlike spherical lenses, which have a constant curvature across their surfaces, aspheric lenses...
auto-iris lens
A device for automatic exposure control in which a motor-driven diaphragm adjusts the aperture in response to a signal from a photocell detecting ambient light.
Barlow lens
A negative lens used to increase the effective focal length of a telescope objective.
Bertrand lens
A small convergent lens, located between the objective and eyepiece of a microscope, that focuses an image of the upper focal plane of the objective in the focal plane of the eyepiece. It is commonly...
biconcave lens
A lens having each of its outer faces curved inward.
biconvex lens
A lens having each of its outer faces curved outward.
bifocal lens
A two-part lens that has a different focal length for each part. Generally, it is used in eyeglasses to correct for both near and far vision.
Billet's split lens
An experimental lens used to produce interference fringes. A positive lens is cut into halves along its center, and the halves are separated. This produces a double image of a slit source set...
biplanar lens
Electron lens consisting of an homogeneous axial electric field.
bitoric lens
A lens, both surfaces of which are ground and polished into a toric or cylindrical form.
cartesian lens
A lens, one surface being a cartesian oval, that produces an aplanatic condition.
Cassegrain lens system
A two-mirror lens design used in astronomical telescopes, the primary being a parabola, the secondary a smaller hyperbola. The image formed is free of spherical aberration and color and is located...
cathode-ray tube lens
A high-quality, narrow-angle lens of high aperture designed for low magnification in the recording of cathode-ray tube images.
Celor lens -> Dogmar/Aviar lens
A general-purpose lens, also known as the Celor lens, used widely in photography and commercial processing; it has the form of a triplet with a split flint element.
centered lens system
A lens system in which the centers of curvature of all surfaces fall on a common axis.
collective lens
A convex or positive lens that serves to collect energy and direct it into subsequent system optics.
complex lens
A lens made up of a number of lens elements arranged into two or more groups.
compound lens
A lens composed of two or more separate elements of optical glass that may or may not be cemented together. The surfaces of the elements are shaped to reduce or eliminate the aberrations inherent in...
concave lens -> diverging lens
A diverging lens is a type of lens that causes parallel rays of light to spread out or diverge. It is thinner in the center than at the edges and is commonly referred to as a concave lens. The most...
concavo-convex lens
A lens with one concave surface and one convex surface; synonymous with meniscus.
concentric lens
A lens having surfaces whose centers of curvature coincide.
conical lens
A lens with a surface that is a cone instead of the usual sphere.
converging lens
Also known as convergent lens or convex lens. A lens that converges an incident bundle of rays to a focus.
convertible lens
Any lens with at least two lens elements, each of which can be used singly or in combined configurations.
convex lens -> converging lens
Also known as convergent lens or convex lens. A lens that converges an incident bundle of rays to a focus.

Photonics Dictionary


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