n
A condenser composed of two lenses which concentrates and controls the light which passes through an examined specimen before that light enters the objective of a microscope, used to obtain high levels of magnification.
n
(optics) A device that simulates aberration in an image.
adj
(photography) Uniting the rays of light into one focus, as a certain kind of lens does.
n
A lens that enlarges the field of vision.
n
(photography) An anastigmatic lens.
n
(optics) A lens that has been corrected for spherical aberration and coma in order to produce a rectilinear image.
n
(optics) An instrument for measuring the magnifying power of a lens or system of lenses.
n
(optics, astronomy) A Barlow lens.
n
(optics) A lens that is designed to minimize spherical aberration.
n
A dioptric telescope, fitted with two tubes joining, so as to enable the viewing of an object with both eyes at once; a double-barrelled field glass or opera glass.
n
A hand-held device consisting of a series of lenses and prisms, used to magnify objects so that they can be better seen from a distance, and looked at through both eyes.
n
A device for controlling the visual stimulation of the eye.
n
(optics) A lens (or combination of lenses) designed to gather light and focus it onto a specimen or part of a mechanism.
n
Any of a pair of confocal mirrors or lenses
n
A refracting lens, which can be used to cauterise.
n
An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct.
n
A large lens constructed in several parts or layers, extending in a series of annular rings beyond the central lens, and used in lighthouses.
n
A disc with opaque and transparent sectors that is rapidly rotated to reduce the intensity of a light source.
n
An attachment to a microscope, telescope, etc. for making the image erect instead of inverted.
n
A small monocular refracting telescope.
n
A microscopic objective of short focal distance designed to work with a drop of liquid between the front lens and the slide, so that this lens is practically immersed.
n
An adjustable diaphragm by which the diameter of an approximately circular opening may be controlled, as for regulating the aperture of a lens; it consists of a number of movable thin curved plates fastened at regular intervals around the inside of a ring, the positions of which are simultaneously adjusted by a single knob on the outside of the lens. It is used in cameras and microscopes.
n
A folding magnifying glass which, when unfolded, forms a frame for the lens at a pre-focussed distance. Commonly used in stamp collecting.
n
A magnifying glass, usually mounted in an eyepiece, often used by jewellers and watchmakers.
n
A magic eye tube: a vacuum tube display device which was used as a tuning indicator.
n
An instrument made of convex glass, used to magnify.
n
The lens or lenses of a camera, microscope, or other optical device closest to the object being examined.
n
The eyepiece of a microscope or other optical instrument.
n
(countable, astronomy) A certain type of flat eyepiece.
adj
(optics) Designed to focus on both near and distant objects at the same time, typically by means of a tilt in the lens
n
A quartz crystal lens used in spectacles.
n
(optics) An aggregate or collection of rays of light, especially when diverging from, or converging to, a point.
n
The aperture in a pinhole camera or camera obscura
n
An opera glass or field glass with an oblique mirror arranged for seeing objects that do not lie directly before the eye.
n
(historical) An eyeglass with or without a handle; a monocle.
n
The lens of a camera obscura mounted in a ball that fits a socket in a window shutter so as to be easily turned, like the eye, to different parts of the landscape.
n
A pair of adjustable stereoscopic binoculars consisting of two periscopes.
n
(slang) A periscope, telescope, microscope or oscilloscope.
n
(astronomy, historical) A device consisting of a closeable ball of blackened wood surrounding a glass lens that focuses light onto a selenium cell attached to a galvanometer; used by astronomers to measure the light variations of a heavenly body.
n
The place on a microscope where the slide is located for viewing.
n
A pair of binoculars consisting of two periscopes.
n
A spectacle lens whose magnifying power varies from top to bottom, allowing them to be used for both distance use and for reading
n
A magnifying glass consisting of two planoconvex lenses, designed to correct spherical aberration and chromatic dispersion.
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