parfocalityn.
/ˌpɑːfəʊˈkalᵻti/, U.S. /ˌpɑrfoʊˈkælədi/ Optics.
The property of being parfocal.
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the world > physical sensation > sight and vision > optical instruments > lens > [noun] > qualities of lenses
power1673
refracting angle1676
resolution1831
depth of focus1852
astigmatism1859
aplanatism1869
apochromatism1887
covering power1895
coverage1936
asphericity1944
parfocality1955
1955 Science 2 Dec. 1077/1 (advt.) The new Citoplast stereomicroscope with built-in quintuple magnification changer, unusually long working distance, and parfocality of all five objectives.
1971 J. H. Richardson Optical Microsc. for Materials Sci. i. 41 Parfocality is not an inherent property of an objective, but is rather a convenience often provided on the more modern microscopes.
1981 Nature 1 Jan. p. xv/1 The V-20A has newly designed projection lenses that ensure high resolution. parfocality, parentricity and magnification accuracy.
This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).
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n.1955