apochromat

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apochromat

[‚ap·ə′krō·mat]
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DETAILS: Stellarvue SV70T apochromatic refractor with ZWO AS1I600MM Pro CMOS camera.
These special apochromatic lenses correct specifically for color and dramatically reduce chromatic aberration.
Fluorite, ED (extra-low dispersion), or APO (apochromatic) glass will cost you a couple of hundred dollars extra.
"Apochromatic lenses are specifically coated so that all of the visible wavelengths are focused to one plane, which produces a much sharper, higher contrast, more well-defined image.
Just for this experiment, the manufacturers graciously loaned me a Tele Vue-NP101is apochromatic refractor, a Finger Lakes ML-8051 CCD camera, and a Bisque MyT Paramount field tripod.
It also features a triple apochromatic lens system, which reduces fringing, dilution of color fidelity, and degradation of resolution.
b) A tracking equatorial mount with a Canon 500D camera attached to a Megrez 72mm apochromatic refractor with a x2 converter for a total focal length around 900mm.
But it isn't just the focal length that will determine the photographer's choice of lens--other considerations include the provision of a built-in vibration reduction system to counteract camera shake; an ultrasonic lens motor to ensure that autofocus operation is silent; apochromatic lens elements for reducing optical aberrations; and a 'fast' maximum aperture.
This is one area in which high-quality apochromatic (free from color error) refractors excel.
The sweet spot in the middle belongs to brands like Sightron and Pentax, which combine multicoated aspherical lens technology with apochromatic glass, magnesium bodies and p-coat prisms for an exceptional quality-to-cost ratio.
The single-reflection V-shaped light path and improved apochromatic relay lens maintain the highest image intensity and optical correction level.