apochromat


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apochromat

[‚ap·ə′krō·mat]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The emission was recorded by a fully computerized CCD-camera imaging system (Polychrome II, TILL Photonics) at 525 nm, using a 63x 1.0 NA objective (Zeiss W-Plan Apochromat VIS-IR) and applying 4x4 pixel binning.
Part of TMB's Signature Series, this 92-mm apochromat is a fast f/5.5 triplet-lens design, making for a stubby, ultra-compact tube assembly.
While not unique, its striking carbon-fiber tube certainly helps set this 80-mm f/7 apochromat apart.
$395 mount) $1,220 Mount Tele Vue Tele-Pod included Optics type apochromat achromat Aperture 60 mm 100 mm Focal length f/ratio 360 mm f/6 640 mm f/6.4 Finder none built-in Mount type altazimuth equatorial (fork) Motor drive no no Computerized "Go To" no no Shown with optional star diagonal and eyepiece.
STELLAR APO Stellarvue adds a new affordable 4-inch apochromat to its line of premium-quality refractors.
One way to reduce the problem of chromatic aberration to negligible levels--and to keep the tube length manageable in larger scopes--is to introduce a third glass element to the objective, producing a triplet, or apochromat. Alternatively, exotic substances such as fluorite may be substituted for one or more of the lens elements, resulting in an apochromatic doublet.
It's the only 90-millimeter apochromat made with a three-element objective, which offers a level of color correction not possible with two-element designs.