Function: noun
Date: 1936
: a lens (as of a camera or projector) in which the image size can be varied continuously while the image remains in focus
Function: noun
Date: 1936
: a lens (as of a camera or projector) in which the image size can be varied continuously while the image remains in focus
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012