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Parfocal   Listen
adjective
Parfocal  adj.  (Opt.) With the lower focal points all in the same plane; said of sets of eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope or telescope) with which they are used. "the convenience of a microscope with parfocal objective lenses"






Collaborative International Dictionary of English 0.48







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