noun
- the property of an optical system in which the focus remains constant when magnification is changed
Usage: optics; technical
Examples
- The microscope’s parfocality allows students to switch between objectives without losing focus.
- Parfocality is an essential feature in high-quality microscopes used for research.
- The telescope’s parfocality makes it easy to change eyepieces during observation.
- Modern compound microscopes are designed with parfocality to improve user experience.
- The lack of parfocality in older instruments required constant refocusing when changing lenses.