Usually means: Lens system minimizing spherical aberration.
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We found 9 dictionaries that define the word aplanat:

General (7 matching dictionaries)
  1. aplanat: Merriam-Webster
  2. aplanat: Oxford Learner's Dictionaries
  3. aplanat: Collins English Dictionary
  4. aplanat: Wordnik
  5. aplanat: Wiktionary
  6. Aplanat: TheFreeDictionary.com
  7. aplanat: Merriam-Webster

Art (1 matching dictionary)
  1. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)

Medicine (1 matching dictionary)
  1. Aplanat: Medical dictionary

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Definitions from Wiktionary (aplanat)

▸ noun:  (optics) A lens that has been corrected for spherical aberration and coma in order to produce a rectilinear image.

Similar:
aplanatism, best form lens, lateral aberration, collimation, longitudinal aberration, corrective lens, aperture, convex lens, spherical aberration, aberration, more...

Opposite:
spherical, convex, curved

Types:
doublet, triplet, meniscus, achromatic, plano-convex, plano-concave, biconvex, biconcave, more...

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Similar:
aplanatism, best form lens, lateral aberration, collimation, longitudinal aberration, corrective lens, aperture, convex lens, spherical aberration, aberration, more...

Opposite:
spherical, convex, curved

Types:
doublet, triplet, meniscus, achromatic, plano-convex, plano-concave, biconvex, biconcave, more...



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