1. The property of an optical system (especially a microscope) in which different objective lenses are positioned so that they remain in focus at the same distance from the specimen when changed.
Usage: technical; microscopy; plural form of parfocality

Examples

• The microscope's parfocalities allow researchers to switch between objectives without refocusing.
• Modern microscopes are designed with parfocalities to improve workflow efficiency.
• The parfocalities of the lens system ensure consistent imaging across different magnifications.