An optical instrument consisting of a well- corrected objective lens or mirror with a light source and or object/image (i.e. illuminated slit or retical) at its focal plane. Collimators are used to calibrate and align optical devices and elements,...

When a lens system with a circular aperture is free of aberrations, the image of a point object will appear as a disc of...

An oil required by oil-immersion objectives that is applied between the exterior of the objective lens and a cover glass or...

An image-forming system that uses mirrors rather than lenses. Such objectives are frequently used for astronomical...

Also known as a white-light interferometer. Measures surface texture and shape from nanometer-scale roughness to...

The liquid used in microscopy to fill the space between the high-power objective lens and the microscope slide in order to...

The limited light-gathering area of an optical system. The area is normally restricted to an edge or outer surface of an...

An apochromat, often referred to as an apochromatic lens or apochromatic objective, is a type of optical system designed to...

A telescope that uses a reflecting objective to focus an image of a distant object at a focal point.

A colorimeter is a device used to measure and quantify the color characteristics of an object or a light source. It provides...

The position and shape of the image of a point source, as predicted by geometric optics alone. The geometric image is to be...

Also known as single plane illumination microscopy (SPIM), this process was designed for imaging of sensitive samples and...

A telescope that corrects dispersion and spherical aberration through the use of one or more lenses, usually smaller than...

An instrument consisting essentially of a tube 160 mm long, with an objective lens at the distant end and an eyepiece at the...

A microscope eyepiece designed for use with apochromatic objectives. Since apochromatic objectives are undercorrected for...

A microscope that uses a reflecting objective; often used with ultraviolet or infrared radiation.

Metrology is the science and practice of measurement. It encompasses the theoretical and practical aspects of measurement,...

A microscope equipped with a polarizer, an analyzer and a Bertrand lens to focus on the upper focal plane of the objective....

A condenser that forms a hollow cone-shaped beam of light with its focal point in the plane of the specimen. If it is used...

In compact disc and CD-ROM technology, the portion of the drive that projects the laser light onto the surface of the media...

An astronomical telescope is a type of optical instrument designed to gather and magnify light from distant celestial...

A microscope designed so that the specimen is located face down above the objective.

The lens located at the object end of a microscope tube. A wide range of objectives is available, including simple...

A wedge in a rangefinder or heightfinder used to displace the image produced by one telescope so that it coincides with that...

Machine vision lighting refers to the use of specific lighting techniques and equipment in the field of machine vision,...

Photographic recording that uses infrared radiation as the light source to form an image of a microscopic object and a...

A photographic objective that uses the thick meniscus principle to obtain its power. It is designed to photograph small...

An objective that uses the mineral fluorite in its construction to reduce the secondary spectrum. It is usually intermediate...

Fluorescence imaging technique in which the excitation light from the objective is directed into the sample producing...

A Michelson-type interference microscope used to produce interference patterns of reflective specimens through the...

A biomarker, short for biological marker, refers to a measurable and quantifiable indicator of a biological condition,...

Image of a uniform source through the sample of a microscope image system. Light from the sample plane is reimaged by the...

Design and engineering consulting services refer to professional services provided by specialized firms or individuals to...

A form of a stereoscopic microscope having paired objectives, prisms and eyepieces, and invented by H. Greenough.

A telephoto lens form noted for its lack of distortion.

Optical design software refers to specialized computer programs used by optical engineers, physicists, and designers to...

The optical element that receives light from the object and forms the first or primary image in telescopes and microscopes....

1. A lens situated at or near the plane of an internal image to project the aperture of a previous objective or erector upon...

The image of the aperture stop, usually the objective lens, that is produced by the eye lens. When the exit pupil of the...

A refracting telescope that yields an erect image by the use of a positive lens for its objective and a negative lens for...

Low Earth orbit (LEO) refers to a region in space that is relatively close to Earth's surface, typically characterized by...

A CubeSat is a type of miniaturized satellite characterized by its standardized size and modular design. CubeSats are...

An optical tooling instrument consisting of an objective lens, a focusing lens, an optical micrometer, a reticle and an...

A microscope that has an annular stop in the lower focal plane of the condenser, and a quarter-wave retarding and absorbing...

1. A prism used in some instruments to bend light 90° before it enters the objective. 2. A dispersing prism located in...

Digital signal processing (DSP) refers to the manipulation and analysis of signals, which are representations of physical...

A form of high-power microscope objective where the space between the object and the first element is filled with an oil...

Laser annealing is a process that involves using a laser beam to heat and modify the microstructure of a material, typically...

A small convergent lens, located between the objective and eyepiece of a microscope, that focuses an image of the upper...

An optical instrument consisting of an objective lens, a coherent (usually flexible) fiber bundle and an eyepiece to examine...

A telescope with a concave paraboloidal objective mirror and a small plane (diagonal) mirror that reflects rays from the...

A negative lens used to increase the effective focal length of a telescope objective.

An airspaced achromatic doublet telescope objective.

A machine vision system is an integrated combination of hardware and software components designed to capture, process, and...

A simple form of astronomical telescope that uses a fixed objective and a focusable eyepiece. The objective forms an...

A form of high-power microscope objective.

A microscope that can be used to observe and magnify microscope specimens while they are being centrifuged. The objective...

An instrument designed to measure the numerical aperture of an objective.

A circular lamp or bundles of optical fibers placed around the perimeter of an objective lens to illuminate the object field...

A specially designed microscope for observing the etched surface of a polished metal specimen. The specimen is often laid...

A telescopic system having an eyepiece, a reticle and an objective. The instrument measures wavefront power in diopters.

An Abbe condenser in which the upper lens element is fixed. The lower lens may focus the illumination between the elements...

In microscopy, the clear distance between the specimen being viewed and the first optical element of the objective lens.

A collimator having, at one end of a tube, an objective lens, and at the other, a reticle with a pair of spaced lines...

An objective measure of an object's brightness that is derived from the ratio of the luminance of its lightest section to...

With respect to microscopy, light that is directed down through the objective onto the specimen and then returned by...

A coarse diffraction grating that is used to form a scale of intensities to determine the relative magnitudes of stars. The...

A pair of telescopes with prismatically erected images, mounted side by side with the eyepieces at the interocular distance...

A technique whereby the sample is illuminated by a hollow cone of light larger than the acceptance angle of the objective,...

Wide-field fluorescence microscopy uses either naturally occurring structures or staining with fluorescent tags that are...

The field of view seen through some types of coincidence rangefinders. It is formed by the juxtaposition of opposite halves...

A compound prism consisting of an assembly of small prisms cemented together that is used in a coincidence rangefinder to...

1. The focal point. 2. To adjust the eyepiece or objective of a telescope so that the image is clearly seen by the observer....

The line of vision; the optical axis of a telescope or other observation system. The straight line connecting the object and...

Brightfield refers to a type of microscopy and imaging technique in which the specimen is illuminated with a white light...

Lenses or prisms that serve to erect the image; i.e., to bring the image upright after it has been inverted by the objective.

In a microscope, the physical distance between the focal points of the objective lens and the eyepiece. The standard tube...

The distance between the object and the cornea, or the first surface of the objective in an optical device.

The second adjustable iris diaphragm in an optical system. In the common microscope condenser system, it usually is located...

The line that divides the two half-images in a coincidence rangefinder. The two halves of the images formed by the two...

A telescope objective with excellent spherochromatic correction, consisting of a meniscus crown and a meniscus flint, both...

In a microscope, the optical assembly that focuses light on the specimen and into the objective.

A microscope objective designed to be used without liquid between the cover glass and the objective, or, in the case of...

A catadioptric lens assembly consisting of a Maksutov corrector and a spherical primary mirror.

Phase contrast microscopy is an optical microscopy technique that enhances the contrast of transparent and colorless...

Also known as reversed telephoto lens. A lens consisting of an ordinary objective with a negative component near its front...