Anastigmat
A compound lens which has been corrected for the lens aberration "astigmatism".
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Anastigmat
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Edited by U. kulick
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I've had a Peak Anastigmat 4x loupe for a couple of years, and been happy with it (it cost ~$150). After reading the raves over the Schneider 4x, I decided to get one.
Well, the Anastigmat was a separate line of lenses - essentially Tessars with the exception of the 6.3/105, 6.3/130 and 7.7/8in. Some notable Anastigmats were: 7.7/8in Covers 5x7 "process" lens, well-corrected for close-up work.
 See also: Lens, Camera, Photograph, View, Lenses
  
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