aplanatic

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Related to aplanatic: aplanatic Gregorian, aplanatic lens

aplanatic

[ap″lah-nat´ik]

correcting or not affected by spherical aberration.

ap·la·nat·ic

(ap-la-nat'ik),

Pertaining to aplanatism, or to an aplanatic lens.

Farlex Partner Medical Dictionary © Farlex 2012

ap·la·nat·ic

(ap-lă-nat'ik)

Pertaining to aplanatism, or to an aplanatic lens.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

aplanatic

Pertains to an optical system which is free from spherical aberration and coma. See aplanatic focus; aplanatic lens.

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References in periodicals archive ?

Billed as aplanatic Schmidt telescopes, this series of 8-, 9Y4-, 11-, and 14-inch tube assemblies incorporates a 2-element field flattener and coma corrector in the main light-baffle tube that promises to correct distortions to the edge of the largest CCD detectors on the market.

New Schmidts

In fact, one of the designs discussed there is an aplanatic (coma-free) SCT virtually indistinguishable from what Meade is marketing as an "Advanced Ritchey-Chretien." Meade should call it an Advanced Schmidt-Cassegrain design instead.

RC or not RC: that is the question

Collaborating with French optical designer Henri Chretien, Ritchey showed that a Cassegrain-style reflector with two approximately hyperboloidal mirrors would be aplanatic (free of coma) and thus able to cover large photographic plates from corner to corner with beautifully round stars.

A preview of Meade's RCX400: here's a behind-the-scenes peek at what some people are calling the biggest news to hit the commercial telescope market in years

Optics won, and we unscrewed the machined lens cap to reveal the aplanatic, three-element objective, which has a central element made of ED glass.

TEC's 5 1/2-inch Apochromat: there's no denying that high-end apochromatic refractors are currently enjoying an unprecedented wave of popularity. Here's one of the reasons

It is an aplanatic design (with the flint element a meniscus lens), which yields better spherical correction and reduced coma compared with designs that use a plano-concave flint element.