parfocal

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parfocal

(pɑːˈfəʊkəl)
adj
(General Physics) optics (of a lens) maintaining focus even if magnification is changed
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Parfocal lens design allows you to maintain precise focus while using the zoom control
The Vinden CZ 640 has a 35 -105 mm continuous-zoom parfocal lens with a 3x optical zoom, 4x digital zoom, and horizontal field of view (HFOV) from 17.1 degrees to 1.5 degrees.