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aplanatic

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aplanatic /ap·la·nat·ic/ (ap″lah-nat´ik) correcting spherical aberration, as an aplanatic lens.
ap·la·nat·ic (pl-ntk)
adj.
Of or relating to an optical lens that is free from chromatic or spherical aberration.
aplanatic [ap″lah-nat´ik]
correcting or not affected by spherical aberration.
aplanatic 
Pertains to an optical system which is free from spherical aberration and coma. See aplanatic focus; aplanatic lens.
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Engineered using an aplanatic design like a Ritchey-Chretien, Meade's ACF optical design consists of a hyperbolic secondary and corrector lens/primary mirror combination that performs as one hyperbolic element, eliminating coma and diffraction spikes found in the much more expensive Ritchey-Chretien telescopes.
After 27 Years of Continuous Production, Meade Drops ... by Business Wire
Aplanatic lenses correct for coma and spherical aberrations.
CVI Laser Announces Fused Silica Aplanats for UV and High Energy ... by Business Wire
 
 
 
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