parfocality

parfocality

(ˌpɑːfəʊˈkælɪtɪ)
n
(General Physics) optics the quality of being parfocal
References in periodicals archive ?
Lens parfocality allows for sustained focus across the entire magnification spectrum from 35x to 500x.
So if parfocality is a concern, you are probably better off buying one set rather than mixing brands.
Current microscopes can store the z-focus position with full consideration of the parfocality adjustment.
Among these properties are parfocality, which eliminates the constant need to refocus when changing magnification; and plan objectives, which correct the image for field flatness and produce an image that is as sharp on the edges as it is m the middle.