<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">zoom lenses</topic></authority><related type="broader"><topic>photographic lenses</topic></related><variant type="other"><topic>lenses, parfocal</topic></variant><variant type="other"><topic>lenses, varifocal</topic></variant><variant type="other"><topic>lenses, varifocus</topic></variant><variant type="other"><topic>lenses, zoom</topic></variant><variant type="other"><topic>parfocal lenses</topic></variant><variant type="other"><topic>varifocal lenses</topic></variant><variant type="other"><topic>varifocus lenses</topic></variant><variant type="other"><topic>zoom lens</topic></variant> <note xml:lang="en"><![CDATA[ Lenses which are constructed to allow continuously variable focal lengths within a specific range. The effective aperture and focus settings remain unchanged throughout such adjustments. ]]></note></mads>