achromat


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Related to achromat: Apochromat

achromat

 [ak´ro-mat″]

ach·ro·mat

(ăk-rō'măt),
A person exhibiting achromatopsia.
[G. a- priv. + chrōma, color]

achromat

/achro·mat/ (ak´ro-mat)

achromat

A person who cannot perceive colour or differentiate between any 2 colour samples, except based on luminosity differences.
 
Sub-types
Pentanopia, intrinsic achromatism.

achromat

an achromatic objective.
References in periodicals archive ?
Chevalier made an achromatic meniscus lens, from where the Lomography Art Daguerreotype Achromat draws its inspirations from.
This premium refractor for lunar and planetary observing sports a 4-inch (100-mm) achromat with a focal length of 1,000 mm (f/10).
Al Nagler calculates that the TV-60's color correction is equivalent to that of a traditional f/25 crown-flint achromat.
8-inch (70-mm), 700-mm-focal-length (f/10) achromat with an altazimuth mount, integral dual-axis drives, and an adjustable aluminum tripod.
9 Lens type Achromat Apochromat Focuser size See note (5) 1 1/4 inches Carrying case Included Optional Tripod mounting block Included Optional (8) Minimum tube length 10 1/4 inches 15 3/4 inches Weight 1 lb (0.
The residual spurious color of an ordinary achromat cannot be totally eliminated, but it can be reduced to almost imperceptible levels if the focal length of the lens is sufficiently long.
By the way, achromat means "without color," while apochromat means "without color--but, we're serious this time.
It is a short-focus achromat, which at first glance appears similar to other low-cost, short-tube refractors.
In spite of several problems inherent in its design (especially chromatic aberration), a wellmade achromat is capable of producing superb views that are rich in detail with little false color.
The Vixen 114-ED's color performance was very good, and it is far better than any f/5 to f/8 achromat, but still not the equal of apos such as Vixen's own VX102-FL f/9 fluorite refractor.