apochromat


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apochromat

/apo·chro·mat/ (ap″o-kro´mat) an apochromatic objective.
References in periodicals archive ?
The optical characteristics of CFI SR HP Plan Apochromat Lambda S 100XC Sil is highly corrected and supports high laser power transmission.
Simply put, apochromats have less color fringing than achromats, while semi-apochromats fall somewhere in between.
A $60 filter won't turn your $600 achromat into a $6,000 apochromat.
3-inch) f/8 apochromat, which is scheduled for production in 2004 as the TEC 160 APO, with an estimated cost around $8,000.
Even the best apochromats may have some color artifacts visible on out-of-focus star images that veil the diffraction patterns.
Modern apochromats, by contrast, use exotic and expensive glasses to reduce false color to virtually undetectable levels.
Until recently, that required a long focal ratio, but modern apochromats can achieve superb color correction in short, convenient tubes.
And short-focus apochromats are by far the most popular instruments for wide-field astrophotography.
These apochromats feature a 3-inch-diameter rear element to minimize light drop-off across a 50-millimeter-diameter image circle.
Stellarvue, manufacturer of high-quality refractor telescopes, introduces its new 90-millimeter apochromats designed with the traveler in mind.
From low-cost Asian imports to premium American and European apochromats, the variety of refractors on the market is greater now than ever before.