# Zoom lenses

Zoom lenses (parfocal lenses) are a special type of varifocal optics in which the working distance is kept constant when changing focal length (i.e. focus is maintained throughout the process). Actually, a zoom lens is generally defined as a lens that can change magnification without changing its working distance: in this category, we can also find macro zoom (e.g. Opto Engineering® MCZR and MZMT) and telecentric zoom lenses (Opto Engineering® TCZR).

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