apochromat


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apochromat

/apo·chro·mat/ (ap″o-kro´mat) an apochromatic objective.
References in periodicals archive ?
Nikons new CFI SR HP Plan Apochromat Lambda S 100XC Sil objective and silicone immersion medium provide high resolution, long working distance imaging capability to support these needs.
However, devotees of fine apochromats also claim that their images have a crystalline clarity and perfection that is beyond price.
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.
The best apochromats typically have residuals between 0.
Apochromats provide the best possible performance per unit of aperture, and are also ideal for astrophotography.
Apochromats are free of the halo issue, but big ones are extremely expensive.
Even the best apochromats may have some color artifacts visible on out-of-focus star images that veil the diffraction patterns.