achromat


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Related to achromat: Apochromat

achromat

 [ak´ro-mat″]
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ach·ro·mat

(ăk-rō'măt),
A person exhibiting achromatopsia.
[G. a- priv. + chrōma, color]
Farlex Partner Medical Dictionary © Farlex 2012

achromat

A person who cannot perceive colour or differentiate between any 2 colour samples, except based on luminosity differences.
 
Sub-types
Pentanopia, intrinsic achromatism.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
References in periodicals archive ?
Gathering 44 percent more light than its sibling (the Meade AR-5), this refractor is a 6-inch (152-mm), 1,220-mm-focallength (f/8) achromat with an LXD55 German equatorial mount, built-in dual-axis worm-drive systems, an illuminated polar-alignment viewfinder, and an adjustable tripod.
My 6-inch f/8 achromat gathers more than twice as much light as its smaller 4-inch f/9.8 cousin, and it also exhibits far more secondary spectrum.
For one of my tests I set up an older 80-mm f/11 achromat (a good scope in its own right) next to the Orion.
For the Nighthawk, advertised as an achromat with a "proprietary" Stellarvue lens, the answer is, Surprisingly little.
Under extremely favorable conditions I pushed the scope in excess of 285x on the Moon--a respectable feat for an achromat of these specifications.
Spatial and temporal limits of vision in the achromat. Journal of Physiology, 377, 365-385.
Achromat: An objective lens system constructed of glass with limited quality of correction for color and spherical aberration.
Despite its spherical mirror, Baby provides pretty good low- and medium-power views when used with the MA (modified achromat) eyepieces supplied with Mama and Papa.
However, observing the crater Muller on 2008 October 8 with my 100mm Borg Achromat I did gain the impression of a darker streak running along and down the crater wall and aligned with the distinct crater chain beyond.