apochromat

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apochromat

[‚ap·ə′krō·mat]
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Apochromatic lenses correct chromatic aberration for three wavelengths of light, often used in super-telephoto lenses.
5 7x optical zoom lens is an advanced apochromatic (APO) lens employing anomalous dispersion (AD) glass to minimize chromatic aberration at all focal lengths and produce sharp, contrasty images.
17 UT, using an Astro-Physics 160EDF apochromatic refractor + SBIG STL-11000M CCD camera + 6nm Tru-Balance H-alpha filter, reveal a near-spherical shell of gas, located within a faint H II region near NGC 6888, that was apparently not noticed (or published) previously due to the density of stars and gas in that area of Cygnus.
The camera incorporates a 7x zoom apochromatic Minolta GT LENS with two anomalous dispersion (AD) glass elements for color accuracy and dual aspherical elements which, combined with a 2x digital zoom, provides a compact lens design with a wide image capture range.
This glass is intended for use in the high-quality lenses of single-lens reflex cameras in which apochromatic color aberration correction is a mandatory feature.
The camera incorporates a 4x zoom, all glass, apochromatic Minolta GT LENS with anomalous dispersion (AD) glass for color accuracy and dual aspherical elements which, combined with a 2.