Assertion: nagler eyepiece | /r/HasAspect | good correction
Facets:
value: for astigmatism
type: PURPOSE
value: for other aberrations
type: OTHER
Source sentences:
text: Invented by Albert Nagler and patented in 1979, the Nagler eyepiece is a design optimized for astronomical telescopes to give an ultra-wide field of view (82°) that has good correction for astigmatism and other aberrations.