Microscopy. Parfocal microscope objectives stay in focus when magnification is changed; i.e., if the microscope is switched from a lower power objective (e.g., 10×) to a higher power objective (e.g., 40×), the object stays in focus. Most modern bright-field microscopes are parfocal.

What is parfocal in microscopy?

Parfocal means that the microscope is binocular. ... Parfocal means that when one objective lens is in focus, then the other objectives will also be in focus.

Why is a parfocal microscope important?

It is helpful for a microscope to be parfocal because the user does not have to adjust the focus when changing the power of magnification. ... This person can then change to a lower magnification and the specimen should still be in focus without the person having to manually adjust the focus.