term referring to the lens. A lens which brings in light from two parts of the spectrum (red and blue wavelengths) to the same focus, reducing Chromatic Aberration. This is the most common lens on a microscope. Color fringes may appear when viewing under bright white light because not all wave lengths are brought within an acceptable focus range. If you use filtered light (monochromatic) as in phase contrast the image will be sharper.

The non-colours

Akromaattinen Akromatisk, okulört färg Without colour.

Without colour, or colour with no saturation - black, white and neutral greys for example.

being of the achromatic color of maximum lightness; having little or no hue owing to reflection of almost all incident light; "as white as fresh snow"; "a bride's white dress"

being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light; "black leather jackets"; "as black as coal"; "rich black soil"

Colors without color, black and shades of gray.

Literally "no colour". A lens combination in which chromatic aberration is corrected by bringing two colours to the same focus.

not suffering from chromatic aberration (q.v.) capable of reflecting or refracting light without chromatic aberration or colour distortion.

Neutral colors, such as white, gray and black, that have no hue.

Free from hue

A lens system designed to reduce chromatic aberration, i.e. to render the same focal length for red and blue light wavelengths at the focal plane.

A refracting optical system without color correction.

No color or hue ( black, white and grey).

Completely colorless white light.

Black, white and greys. Artwork that is executed without color.

(color) A neutral color such as black, white or grey (see chromatic).

Perceived as having no hue; white, black or grey.

Lacking color, black, gray or white.

Color which has no chroma i.e. a Neutral gray, black or white.

lens system that has been corrected for chromatic aberration.

Colour correction system used in conjunction with a colour scanner that removes a degree of extraneous colour.

Lacking hue and saturation. Having color only in the neutral grays, whites and blacks.

Having no hue; white, gray, or black.

adj. Colorless

A neutral color (white, gray, or black) that has no hue. See hue.

A term which describes a lens system which is corrected for chromatic aberration. (see Chromatic Aberration)

Without color. A lens which refracts light of all colors equally is said to be achromatic.

The non-colors... black, white and gray.

Free from chromatic aberration. An achromatic lens is able to transmit light without separating it into colors.

adj. 1. Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black. 2. Refracting light without spectral color separation. 3. Biology Difficult to stain with standard dyes. Used in reference to cells or tissues. 4. Music Having only the diatonic tones of the scale.

Perceived as having no hue or color. White, gray, and black.

Achro -- A term used to describe optics. Generally it means good quality with only some color distortion. Very commonly used to describe entry level (i.e. inexpensive) refracting telescopes.

No color or hue. (Black and white or gray.).

Refers to a two-element lens which offers better performance than a single element lens.

Having no colour or hue i.e. consisting of blacks, whites, and greys.

Having no color or hue; without identifiable hue. Most blacks, whites, grays, and browns are achromatic.

1. Having no color, being black, gray, or white. 2. Being neutral in color. 3. Difficult to color. 4. Lenses practically free from light of unwanted color.