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 (ā-sfîr′ĭk, ā-sfĕr′-) also a·spher·i·cal (-ĭ-kəl)
Varying slightly from sphericity and having only slight aberration, as a lens.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(eɪˈsfɛr ɪ kəl, eɪˈsfɪər-)

also a•spher′ic,

(of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.aspherical - varying slightly from a perfectly spherical shape
optics - the branch of physics that studies the physical properties of light
rounded - curving and somewhat round in shape rather than jagged; "low rounded hills"; "rounded shoulders"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The camera measures an impressive 3.7 (W) x 2.5 (H) x 1.2 (D) inches and is equipped with a 26-52mm f/4.2-6.7 (equivalent to 32.5-65mm with 35mm-format cameras) 2x aspherical zoom lens composed of six lenses in six groups.
Simmons Whitetail Expedition scopes, utilizing aspherical lens system technology, are offered in four configurations: 1.5-6x32mm WA, 3-9x42mm WA, 4-12x42mm WA and 6-18x42mm WA.
Aspherical optics provide a fast f 1.3 maximum iris aperture for excellent low-light performance.
With zoom lenses incorporating one or more aspherical lens elements, however, this distortion is well corrected due to the compensating effect of the aspherical lens.
The design includes two ED (extra lowA[degrees]dispersion) elements and one doubleA[degrees] sided aspherical element, plus four elements with a convex surface facing the subject, which combine to reduce spherical and chroA[degrees]matic aberrations.
The XC16-50mm lens consists of 12 all-glass elements in 10 groups including 3 aspherical elements and 1 ED element.
A redesigned optical path includes an increased number of elements and two aspherical lenses for fast, accurate performance, whilst Canon's acclaimed Optical Image Stabilizer (OIS) technology provides distortion-free images throughout the range of the 10x optical zoom.
The Coolpix A's lens has 7 elements arranged in 5 groups with one aspherical element included.
Your eyes may or may not appreciate the difference of an aspherical lens, and you may not want a 44mm objective.
The lens unit consists of 7 elements in 6 groups with 3 aspherical lenses with 5 aspherical surfaces.