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searching for Achromatic lens 18 found (68 total)

Superachromat (172 words) [view diff] exact match in snippet view article find links to article

The superachromat or superachromatic lens was first conceived and developed by Maximilian Herzberger as the ultimate well-corrected lens. The color shift

Paris inch (342 words) [view diff] exact match in snippet view article find links to article

English inches). This lens had the largest aperture of its day for an achromatic lens. The term for telescopes persisted even in the 20th century, with a

Greenwich 28-inch refractor (1,955 words) [view diff] exact match in snippet view article find links to article

refractor, and was made by the telescope maker Sir Howard Grubb. The achromatic lens was made Grubb from Chance Brothers glass. The mounting is older however

List of largest optical refracting telescopes (1,051 words) [view diff] exact match in snippet view article find links to article

which is not directly comparable because it uses a single element non-achromatic lens, and the short-lived Great Paris Exhibition Telescope of 1900. It used

Apochromat (772 words) [view diff] exact match in snippet view article find links to article

(secondary spectrum) can be up to an order of magnitude less than for an achromatic lens of equivalent aperture and focal length. Apochromats are also corrected

Ernst Leitz GmbH (803 words) [view diff] exact match in snippet view article find links to article

achromatische Linsencombination (The orthoscopic ocular, a newly invented achromatic lens combination) in 1849, describing a new optical formula he had developed

Fuertes Observatory (810 words) [view diff] exact match in snippet view article find links to article

Wisconsin. The glass blanks were ground and polished into a 12-inch achromatic lens by Brashear & Co in 1920. Professor Church spearheaded a campaign to

Dunsink Observatory (779 words) [view diff] exact match in snippet view article find links to article

telescope built by Thomas Grubb of Dublin and completed in 1868. The achromatic lens, with an aperture of 11.75 inches, was donated by Sir James South in

William Selwyn (astronomer) (406 words) [view diff] exact match in snippet view article

disc over an entire sunspot cycle from 1863 to 1874 using a six-inch achromatic lens. Selwyn was seriously ill from 1866 onwards and this, together with

Newton's reflector (1,927 words) [view diff] exact match in snippet view article find links to article

had grown to nearly 50 inches aperture (126 cm) while the largest achromatic lens objective was not more than about 5 inches (13 cm). There has been

Warehouse 13 season 5 (497 words) [view diff] exact match in snippet view article find links to article

Lewis Carroll's mirror, spine of the Saracen, Chester Moore Hall's achromatic lens, Jack LaLanne's stationary bike, Orville Wright's aviator goggles,

Wratten number (656 words) [view diff] exact match in snippet view article find links to article

440 nm. Used for high-altitude photography, and in astronomy to mask achromatic lens color-fringing. 4 yellow Minus-violet Longpass filter blocking visible

Nathan Reingold Prize (127 words) [view diff] case mismatch in snippet view article find links to article

Princeton University Making a Living out of Science: John Dollond and the Achromatic Lens 1990 Michael Aaron Dennis Johns Hopkins University Reconstituting Technical

Otto Wiener (physicist) (1,434 words) [view diff] exact match in snippet view article

through a prism, discarding most of the red side of the spectrum. An achromatic lens focused an 8mm-wide, slightly converging light beam. 220mm after the

Gholam A. Peyman (2,006 words) [view diff] exact match in snippet view article find links to article

860-Fluidic adaptive optics fundus camera 9,164,206-Variable focal length achromatic lens system comprising a diffractive lens and a refractive lens 9,191,568-Automated

Dermatoscopy (3,546 words) [view diff] exact match in snippet view article find links to article

was hand-held and illuminated by a halogen lamp. It also featured an achromatic lens with a 10-fold magnification. To reduce light reflection the lesion

Topogon (1,704 words) [view diff] exact match in snippet view article find links to article

undistorted image. The Pleogon, used for photogrammetry, used a cemented achromatic lens just ahead of the central stop and added two meniscus groups on either

Photographic lens design (4,345 words) [view diff] exact match in snippet view article find links to article

lenses. It was not until 1840 that Chevalier in France introduced the achromatic lens formed by cementing a crown glass bi-convex lens to a flint glass plano-concave