apochromat

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Related to apochromats: apochromatic objective

apochromat

[‚ap·ə′krō·mat]
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Modern apochromats, by contrast, use exotic and expensive glasses to reduce false color to virtually undetectable levels.
Stellarvue, manufacturer of high-quality refractor telescopes, introduces its new 90-millimeter apochromats designed with the traveler in mind.
Until recently, that required a long focal ratio, but modern apochromats can achieve superb color correction in short, convenient tubes.
From low-cost Asian imports to premium American and European apochromats, the variety of refractors on the market is greater now than ever before.
Simply put, apochromats have less color fringing than achromats, while semi-apochromats fall somewhere in between.