achromatic

• Under achromatic (black and white) constant illumination conditions, visual intrascene dynamic range is only about 50-fold (6 bits).
• Shimmering fabrics add sparkle and pizzazz in a subtle way, helping to lift achromatic (black and white) schemes. —  ireland.com Breaking News
• It ought to be achromatic, i. e. consisting of the usual two pieces of crown and flint glass, that its curves are the most recommended, and that it is free from bubbles: to ascertain the latter, hold the lens between the finger and thumb of the right hand, much as an egg-merchant examines an egg before a strong gas flame, and a little to the right of it; this reveals every bubble, however small, and another kind of texture like minute gossamer threads. —  Notes and Queries, Number 188, June 4, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc.
• A 4 inch achromatic, or a silver-on-glass reflector of 6 or 6 1/2 inches aperture, will reveal on a good night many details which have not yet been recorded, and the possessor of instruments of this size will not be long in discovering that the moon, despite of what is often said, has not been so exhaustively surveyed that nothing remains for him to do Only experience and actual trial will teach the observer to choose the particular eyepiece suitable for a given night or a given object. —  The Moon A Full Description and Map of its Principal Physical Features
• There is a central peak, which, though not an easy object, I once glimpsed with a 4 inch Cook achromatic, and have seen it two or three times since with an 8 1/2 inch Calver reflector. —  The Moon A Full Description and Map of its Principal Physical Features

Allen's Synonyms and Antonyms

Used in the Same Context