Abstract
THE steeply curved surface of the field lens of a Kellner-type eyepiece usually introduces considerable spherical aberration of the principal rays. Frequently, this aberration cannot be corrected elsewhere in the system and, in consequence, there is no well-defined exit pupil of the instrument. In the case of a visual instrument, this pupil aberration may cause variations of brightness across the field of view, due to vignetting of the image-forming pencils at the observer's eye pupil. It has been found possible to correct the pupil aberration in a Kellner eyepiece by employing an aspherical surface on the field lens.
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LONGHURST, R. Correction of Pupil Aberration in Kellner-type Eyepieces. Nature 167, 315–316 (1951). https://doi.org/10.1038/167315a0
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DOI: https://doi.org/10.1038/167315a0
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