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Teledyne DALSA - Line Scan Leader 5/24 LB
eyepiece Dictionary Terms

eikonometer
A scale attached to a microscope eyepiece that is seen superimposed on the image and that is used to measure the dimensions...
coincidence rangefinder
An optical instrument used to determine the distance to a target being viewed. Two similar optical systems view the target...
parfocal eyepiece
One eyepiece of a set having equal distances from their mounting interface to their image plane, permitting freedom to...
compensating eyepiece
A microscope eyepiece designed for use with apochromatic objectives. Since apochromatic objectives are undercorrected for...
hyperplane eyepiece
An eyepiece similar to the Huygenian eyepiece, but having an eye lens that is a cemented doublet and that provides more...
orthoscopic eyepiece
A telescopic eyepiece that produces a field of view between 40° and 50°. The eyepiece consists of a single element...
Huygenian eyepiece
An ocular having two planoconvex lenses that are formed from similar glass and that are separated by a space equal to half...
lensometer
An ophthalmic instrument used to measure the magnitude and direction of the maximum and minimum powers of a spectacle lens,...
Greenough microscope
A form of a stereoscopic microscope having paired objectives, prisms and eyepieces, and invented by H. Greenough.
pointer eyepiece
A Huygenian eyepiece containing a pointer at its focal plane that is used -- when viewing an object through the eyepiece --...
Gregorian telescope
A telescope with an ellipsoidal secondary concave mirror that reflects rays from a parabolic primary mirror through an...
mechanical tube length
In a microscope, the physical distance between the focal points of the objective lens and the eyepiece. The standard tube...
distance of distinct vision
The near-point distance of the normal eye. The value of 10 in. or 25 cm is normal. This value is used in evaluating the...
dioptometer
A telescopic system having an eyepiece, a reticle and an objective. The instrument measures wavefront power in diopters.
image splitting eyepiece
An eyepiece having a special prism arrangement linked to a micrometer screw to allow reading of the angular relations...
Erfle eyepiece
A telescopic eyepiece comprising five or six simple lenses in the form of three doublets or two doublets and a singlet.
wide-field eyepiece
An eyepiece or magnifier capable of covering a field of view that is greater than 50°.
ocular prism
The prism used in a rangefinder to bend the lines of sight through the instruments into the eyepieces.
astronomical telescope
An astronomical telescope is a type of optical instrument designed to gather and magnify light from distant celestial...
coincidence prism
A compound prism consisting of an assembly of small prisms cemented together that is used in a coincidence rangefinder to...
eyepiece
Also known as ocular. The lens system used between the final real image in a visual optical system and eye. It acts as an...
goniometer eyepiece
An eyepiece having a rotating index or cross wire linked to an external 360° scale to allow measuring of angles in an...
microscope
An instrument consisting essentially of a tube 160 mm long, with an objective lens at the distant end and an eyepiece at the...
auxiliary telescope
A low-power telescope placed at the eyepiece of an optical system to increase overall magnification. Most often used to...
focus
1. The focal point. 2. To adjust the eyepiece or objective of a telescope so that the image is clearly seen by the observer....
autocollimator
An autocollimator is an optical instrument used for measuring small angular deviations with high precision. It operates on...
Galilean telescope
A refracting telescope that yields an erect image by the use of a positive lens for its objective and a negative lens for...
Ramsden eyepiece
An eyepiece consisting of two planoconvex lenses of the same focal length, with facing convex surfaces.
comparator
1. An eyepiece or magnifier with a scale at its image plane. That scale is placed in contact with an object, permitting...
microscope eyepiece
An eyepiece located at the near end of the microscope tube. It often is a simple Huygens eyepiece, but compensating and...
kidney-bean effect
A dark region created by spherical aberration of an eyepiece's exit pupil. Because of the aberration, an observer's eye must...
erecting eyepiece
An eyepiece combined with an erecting prism or lens system.
objective
The optical element that receives light from the object and forms the first or primary image in telescopes and microscopes....
filar eyepiece
A measuring eyepiece with a screw-micrometer-driven crosshair used to measure the size of the image.
Brucke loupe
A telemicroscope in which a negative eyepiece is used to produce erect images.
diopter movement
The adjustment of the eyepiece of an instrument to provide accommodation for the eyesight differences of individual...
dichroscopic eyepiece
An eyepiece used in a polariscope or polarizing microscope to give a comparison view of the same object under illumination...
flying spot microscope
A microscope that uses a flying spot scanner, directed through the eyepiece, as a light source to determine the features of...
fiberscope
An optical instrument consisting of an objective lens, a coherent (usually flexible) fiber bundle and an eyepiece to examine...
eye lens
The lens of an eyepiece nearest the observer's eye.
pinhole eyepiece
A type of eyepiece, or the modification of an eyepiece, in which a small hole, without a lens, functions as the eye lens;...
prism binoculars
A pair of telescopes with prismatically erected images, mounted side by side with the eyepieces at the interocular distance...
measuring eyepiece
Also known as an eyepiece micrometer. A microscope eyepiece that has a finely divided scale ruled or photographed on a...
grain isolating diaphragm
In a microscope, the diaphragm located between the Bertrand lens and the eyepiece, which is closed during conoscopic viewing...
binocular microscope
A microscope designed with two eyepieces (oculars), permitting the use of both eyes when viewing through the instrument.
rhomboid prism
A reflecting prism that is rhomboidal in shape. It has two parallel transmitting faces, and two parallel reflecting faces;...
optical bench
A support for optical parts comprising a solid bed that permits precise longitudinal movement of one component relative to...
Lippich prism
A small half-shade analyzer placed in the eyepiece of a polarimeter to determine the character of the polarized light...
wide-field fluorescence microscopy
Wide-field fluorescence microscopy uses either naturally occurring structures or staining with fluorescent tags that are...
Bertrand lens
A small convergent lens, located between the objective and eyepiece of a microscope, that focuses an image of the upper...
Newtonian telescope
A telescope with a concave paraboloidal objective mirror and a small plane (diagonal) mirror that reflects rays from the...
astronomical mirror
An astronomical mirror, also known as a telescope mirror or primary mirror, is a key component of a reflecting telescope. It...
Kellner eyepiece
An eyepiece consisting of a planoconvex field lens and a cemented doublet as the eye lens.
Keplerian astronomical telescope
A simple form of astronomical telescope that uses a fixed objective and a focusable eyepiece. The objective forms an...
clear eye distance
In a visual optical system, the axial distance from the last mechanical surface of the eyepiece to the exit pupil.
periplan eyepiece
A well-corrected flat-field eyepiece with good eye relief. Similar to a Huygenian.
GRIN lens
A GRIN (gradient index) lens is a type of optical lens that utilizes a gradient in refractive index across its volume rather...
comparison microscope
Two microscopes that are coupled on a common stand, the two images being projected side by side in the field of view of a...
alignment telescope
An optical tooling instrument consisting of an objective lens, a focusing lens, an optical micrometer, a reticle and an...
eyepiece micrometer
panoramic telescope
A telescope so manufactured that the image remains erect and the position of the eyepiece is unchanged as the line of sight...
field lens
1. A lens situated at or near the plane of an internal image to project the aperture of a previous objective or erector upon...
diopter scale
A scale located on the eyepiece focusing screw and used to measure the amount of defocusing of the eyepiece in diopters. The...
coherent fiber bundle
A coherent fiber bundle (CFB), also known as a coherent fiber optic bundle, is an assembly of multiple optical fibers...
microdisplay
A microdisplay is a miniature electronic display technology that is designed to project visual information onto a small...
stereoscopic rangefinder
A rangefinder similar to a pair of binoculars with a long base, a dot or other wander mark provided in each eyepiece field,...

(66 results found)

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