achromatic objectives

ахроматичен обектив

English-Bulgarian polytechnical dictionary . 2013.

Look at other dictionaries:

  • Non-achromatic objective — A non achromatic objective is an objective lens which is not corrected for chromatic aberration. In telescopes they can a be pre 18th century simple single element objective lenses which were used before the invention of doublet achromatic lenses …   Wikipedia

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  • History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… …   Wikipedia

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  • Apochromat — An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better color correction than the much more common achromat lenses. Chromatic aberration is the phenomenon of different colors focusing at different distances from …   Wikipedia

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  • Joseph von Fraunhofer — (March 6, 1787 ndash; June 7, 1826) was a German optician. He is known for the discovery of the dark absorption lines known as Fraunhofer lines in the Sun s spectrum, and for making excellent optical glass and achromatic telescope… …   Wikipedia

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