apochromat


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apochromat

[‚ap·ə′krō·mat]
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The CFI SR HP Plan Apochromat Lambda S 100XC Sil objective is designed for use with Nikons new silicone oil (ne?
If you're looking for a moderate-aperture apochromat, consider the new arrival from TMB's Signature Series, the TMB-130.
Because this lens is an apochromat, chromatic abberations (axial chromatic abbera- tions) are corrected with elements of special glass materials with anomalous partial disper- sion.
Those more experienced, however, will recognize that the Petzval, SD, and apochromat terms worked into the respective Zenith Star monikers (not to mention the prices) suggest different levels of optical performance.
9 Lens type Achromat Apochromat Focuser size See note (5) 1 1/4 inches Carrying case Included Optional Tripod mounting block Included Optional (8) Minimum tube length 10 1/4 inches 15 3/4 inches Weight 1 lb (0.
The Fluoro-Star FLT-110 is William Optics' first true apochromat, employing a triplet lens designed and fabricated by Telescope Engineering Company (TEC) in Golden, Colorado, itself the producer of a growing line of fine telescopes (its 140-mm apo was reviewed in our December 2003 issue, page 54).
This dramatic reduction in focal length means that even a 7-inch apochromat can be transported to a star party or remote dark-sky observing site.
By the way, achromat means "without color," while apochromat means "without color--but, we're serious this time.
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.