parfocal

American

[pahr-foh-kuhl] / pɑrˈfoʊ kəl /

adjective

Optics.

of or relating to different eyepieces (of telescopes or microscopes) that all focus their images in the same plane, so that they can be interchanged without readjusting the instrument.

First recorded in 1885–90; par ¹ + focal

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Objectives arranged in this way are described as parfocal.

From Textbooks • Aug. 12, 2015

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023