Parfocal is an optical design feature commonly found in microscopes, telescopes, and other multi-objective lens systems. In a parfocal system, the focus remains constant when switching between different magnification levels or objectives. This means that the specimen or object being viewed stays in focus even as the magnification is changed, eliminating the need for significant refocusing adjustments. The parfocal design is achieved by carefully designing and positioning the lenses within the optical system, ensuring that the focal planes of all objectives coincide. This feature greatly enhances the efficiency and ease of use in microscopy and other applications where multiple magnifications are frequently used. Parfocality is particularly valuable in scenarios that require rapid switching between objectives, such as in clinical microscopy or live-cell imaging, where maintaining focus is critical for accurate observations and analysis. The concept of parfocality has a long history in optical design, with early examples dating back to the 18th century. Over time, advancements in lens design and manufacturing techniques have enabled the development of highly precise parfocal systems that meet the demanding requirements of modern scientific and industrial applications.
microscopy, optical design, telescopes, multi-objective lenses, focus, magnification
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