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parfocal lens
A parfocal lens is a lens that stays in focus when magnification/focal length is changed. There is inevitably some amount of focus error, but small enough to be considered insignificant.
==Microscopy==
Parfocal microscope objectives stay in focus when magnification is changed; i.e., if the microscope is switched from a higher power objective (e.g., 40×) to a lower power objective (e.g., 10×), the object stays in focus. Ideally, most bright field microscopes are parfocal.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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