apochromatic


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apochromatic

 [ap″o-kro-mat´ik]
free from chromatic aberration.

apochromatic

(ap″ŏ-krō-mat′ik) [ apo- + chromatic]
Free from spherical and chromatic aberrations.
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References in periodicals archive ?
Reducing this flaw requires turning to premium apochromatic refractors, which employ exotic and expensive glass.
Buying the best telescope: We all want the best buy for our budget. Here's what you need to know to acquire a telescope that can last a lifetime
Apochromatic lenses correct chromatic aberration for three wavelengths of light, often used in super-telephoto lenses.
Choosing a Spotting Scope: Here's some good information to help you make an informed decision when selecting this important sportsman's tool
This stunning view was captured with forty 5-minute exposures with a DSLR mounted on an 80-mm apochromatic refractor.
A Journey to the Dark Site of the Earth: Down Under offered these observers their best views of some dramatic, deep-sky sights
For instance, one might put an apochromatic refractor onto a heavyweight equatorial mount for astrophotography but use the same scope on a lightweight altazimuth mount for airplane travel.
Spend more, get more: money can't buy you love--but it can get you a great telescope
DETAILS: Sky-Watcher Esprit ED80 apochromatic refractor and Moravian Instruments G2-8300 CCD camera with Astronomik LRGB filters.
GALLERY
The expense of completing my master's degree forced me to sell most of them, but I think I've come up with the perfect urban telescope: a 3-inch apochromatic (highly color-corrected) refractor on an altazimuth mount (one that simply moves up and down and side to side) with slow-motion controls and a simple sighting device.
The joys of city observing: do you live in the middle of a light-polluted city? Armed with binoculars or a small telescope, you can hunt down and explore more interesting sky targets than you probably realize
DETAILS: Takahashi TOA-130 apochromatic refractor and QSI 690 CCD camera used with LRGB filters.
GALLERY
These are referred to as apochromatic lenses and are essentially free of chromatic aberration, but you pay a premium for this level of performance.
Getting the right stuff: from a little to a lot, enjoyment of the nightly sky show can be enhanced by the tools of the astronomical trade
The f/8 configuration is similar, with an apochromatic Barlow in front of the secondary and additional lenses built into the drawtube, which results in a low 25% central obstruction.
State of the art--today: here's a look at the cutting edge of telescope technology now
Premium "apochromatic" models in 4-inch and larger sizes use lenses made from special glasses to eliminate false-color fringing around bright objects.
Buying a Telescope: new choices for a new millennium: take the worry and the woe out of the big decision with our guide to buying the telescope that's best for you

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