Telescope vs. Diopter

Telescopenoun

A monocular optical instrument that magnifies distant objects, especially in astronomy.

Telescopenoun

Any instrument used in astronomy for observing distant objects (such as a radio telescope).

Telescopeverb

(ambitransitive) To extend or contract in the manner of a telescope.

Telescopeverb

(ambitransitive) To slide or pass one within another, after the manner of the sections of a small telescope or spyglass.

Telescopeverb

(intransitive) To come into collision, as railway cars, in such a manner that one runs into another.

Telescopenoun

An optical instrument used in viewing distant objects, as the heavenly bodies.

Telescopeverb

To slide or pass one within another, after the manner of the sections of a small telescope or spyglass; to come into collision, as railway cars, in such a manner that one runs into another; to become compressed in the manner of a telescope, due to a collision or other force.

Telescopeverb

To cause to come into collision, so as to telescope.

Telescopeverb

to shorten or abridge significantly; as, to telescope a whole semester's lectures into one week.

Telescopeadjective

Capable of being extended or compacted, like a telescope, by the sliding of joints or parts one within the other; telescopic; as, a telescope bag; telescope table, etc.; - now more commonly replaced by the term telescoping.

Telescopenoun

a magnifier of images of distant objects

Telescopeverb

crush together or collapse;

Telescopeverb

make smaller or shorter;

Telescope

A telescope is an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. The first known practical telescopes were refracting telescopes invented in the Netherlands at the beginning of the 17th century, by using glass lenses.

Diopternoun

A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.

Diopternoun

The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.

Diopternoun

A lens element attached to the front of a photographic lens to shorten the lens's minimum focus distance; also called a "close-up filter".

Diopternoun

(obsolete) Any lens system, such as a telescope.

Diopternoun

(obsolete) A theodolite or similar surveyor’s angle measuring device.

Diopternoun

(obsolete) An alidade.

Diopternoun

(obsolete) A surgical speculum.

Diopternoun

(obsolete) An instrument for drawing the skull by projections.

Diopternoun

An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.

Diopternoun

a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters