anastigmat

American  

[uh-nas-tig-mat, an-uh-stig-mat] / əˈnæs tɪgˌmæt, ˌæn əˈstɪg mæt /

noun

Optics.

1. a compound lens corrected for the aberrations of astigmatism and curvature of field.

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anastigmat British  

/ æˈnæstɪɡˌmæt, ˌænəˈstɪɡmæt /

noun

1. a lens or system of lenses designed to be free of astigmatism

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Etymology

Origin of anastigmat

1885–90; < German, back formation from anastigmatisch anastigmatic

Example Sentences

This makes a most desirable outfit at a surprisingly low price for an anastigmat equipment.

From Project Gutenberg

It is an anastigmat of the very first quality, fully corrected for definition and flatness of field, and working at a speed of f.6.3.

From Project Gutenberg

But an anastigmat lens can be so corrected as to permit the use of larger diaphragm openings and still produce sharp, clear negatives.

From Project Gutenberg

This larger opening admits more light within a given time than that of the R. R. lens, hence the anastigmat is much faster.

From Project Gutenberg

For those, however, who wish even greater efficiency and capabilities, we supply the anastigmat lens equipments.

From Project Gutenberg