A microscope or telescope lens that has been corrected for chromatic aberration through advanced optical design, allowing excellent color fidelity.
From Greek apo- (away from) + chroma (color) + -at (agent noun suffix). Optical terminology developed in the 19th century.
Apochromats revolutionized microscopy and astronomy—by eliminating the colored fringing that plagued earlier lenses, they revealed details invisible before, from bacteria to distant galaxies, making them essential to modern biology and astronomy.
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