parfocal

[pahr-foh-kuhl]

adjective

Optics.

1. 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.

Word History and Origins

Origin of parfocal¹

First recorded in 1885–90; par ¹ + focal

Example Sentences

Rumour that David Gill may get involved #mufc Preamble: Yesterday figures close to Wayne Rooney let it be known that he was considering a move from Old Trafford; today the media's parfocal lens is focused on a silly-money transfer to Manchester City.

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