The term parfocal in microscopy refers to the capability of a microscope to maintain focus on a specimen while switching between different objective lenses. This feature is particularly important in microscopy, as it allows for a seamless transition when examining a sample at various magnifications without the need to refocus the microscope each time.
For example, if you start viewing a slide using a lower magnification objective, like a 10x lens, and then switch to a higher magnification lens, say a 40x lens, a parfocal microscope allows the specimen to remain in focus or require only a minor adjustment to achieve clarity. This saves time and improves the efficiency of the observation process, especially when a researcher needs to change magnifications frequently.
Not all microscopes are parfocal, so it’s a feature worth considering when selecting a microscope, especially for detailed analysis or educational purposes. In summary, parfocality enhances the usability and effectiveness of microscopes in various applications.