Synonym achromat.

In digital photography, achromatic is the term used to describe a camera lens system that is corrected for chromatic aberration, a defect in some optical lens systems that adds false color to images. [..]

A lens that transmits white light without dispersing it into a color spectrum. It usually consists of two component parts, cemented together to form one unit.

A lens which is free from chromatic aberration, this produces a image which has no colour fringes. It is created by combining a crown glass lens and a flint glass lens.

a lens specially designed and coated to correct for the tendency of light to separate into colors when passing through glass. An achromatic lens corrects this such that colors are more accurate after [..]

A combination of lenses made of different glass, used to produce images free of color distortion.

An Achromatic lens is a system of lenses joined in order to minimize color and shape distortions (chromatic and spherical aberrations) that are inherent in a single lens system.

a lens that is specially designed and coated to correct for the tendency of light to separate into colors when passing through glass. An achromatic lens corrects this such that colors are more accurat [..]

Correction for primary chromatic aberration at two wavelengths. The simplest form is an achromatic doublet, consisting of two optical elements, a positive crown glass element and a negative flint glas [..]

A compound lens made of two or more lens's having different indices of refraction, so correlated as to minimise chromatic aberration. (05 Mar 2000)

Without dip; horizontal.

is a combination of lenses made of different glass. These bring two wavelengths into focus (normally red & blue) on the same plane. Achromatic lenses are used to take chromatic aberrations away fr [..]

(optics) A lens generally composed of two separate lenses, one convex and one concave and generally of different materials, in such a way that the chromatic aberration produced by one is corrected b [..]