Photonics Dictionary | Terms | Photonics Dictionary

Photonics Dictionary

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objectives x

teleobjective -> telephoto lens

A compound lens so constructed that its overall length is equal to or less than its effective focal length.

telescope exit pupil

The image of the aperture stop, usually the objective lens, that is produced by the eye lens. When the exit pupil of the telescope coincides with the entrance pupil of the eye of the observer, the...

tristimulus colorimeter -> colorimeter

A colorimeter is a device used to measure and quantify the color characteristics of an object or a light source. It provides objective and standardized color information, typically expressed in terms...

variable-focus condenser

An Abbe condenser in which the upper lens element is fixed. The lower lens may focus the illumination between the elements so that it emerges from the fixed lens as a large-diameter parallel bundle....

vertical incident illumination

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

white-light interferometer -> optical profiler

Also known as a white-light interferometer. Measures surface texture and shape from nanometer-scale roughness to millimeter-scale step heights. A standard arrangement includes an illumination source,...

wide-field fluorescence microscopy

Wide-field fluorescence microscopy uses either naturally occurring structures or staining with fluorescent tags that are activated by specific wavelengths of light and then emits a different...

working distance

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

Photonics Dictionary

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