Huygens eyepiece

An eyepiece consisting of two lens elements with an intermediate image plane and associated stop between.

Synonyms: Huygenian eyepiece, internal-diaphragm eyepiece

See also: eyepiece, Ramsden eyepiece, Kellner eyepiece

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Linear Measurements (Micrometry)

A comprehensive review of eyepiece reticles and stage micrometers for measurements.