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parfocal

[pahr-foh-kuh l] /pɑrˈfoʊ kəl/
adjective, Optics.
1.
of or pertaining 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.
Origin
1885-1890
1885-90; par1 + focal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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