| apochromatic |
An apochromatic telescope uses three or more lens elements, one or more usually possessing special properties, to eliminate chromatic aberration. Apochromatic refractors are usually regarded as giving the best quality image but are by far the most expensive type of telescope for a given size.
출처: www.dirtyskies.com/index.php/glossary/
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| apochromatic lens |
A lens which removes virtually all chromatic aberration from an image. It is vastly superior to an achromatic lens.
출처: www.singularsci.com/Glossary1.htm
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