| parfocal objectives | <microscopy> Objectives which are mounted so that only a small adjustment of the bodytube and stage is necessary to focus after changing from one objective to any of the others. They are mounted in such a way that the back focal plane is in the same position on the optical axis of the microscope for each objective. Objectives used on a rotating nosepiece are usually parfocal. Eyepieces are also parfocal within any given manufacturer's (05 Aug 1998) |
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| eyepiece, parfocal | <microscopy> Eyepieces with common focal planes so that they are interchangeable without refocusing. (05 Aug 1998) |
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