Editing Objective (optics) (section)

==Photography and imaging==
[[File:Lens Canon EF 50mm f1.4.jpg|thumb|upright|Camera photographic objective, [[focal length]] 50&nbsp;mm, [[F-number|aperture]] 1:1.4]]
[[Camera lens]]es (usually referred to as "photographic objectives" instead of simply "objectives"<ref>{{cite book |title=The Focal Encyclopedia of photography |url=https://archive.org/details/focalencyclopedi00lesl |url-access=registration |first1=Leslie |last1=Stroebel |first2=Richard D. |last2=Zakia |year=1993 |page=[https://archive.org/details/focalencyclopedi00lesl/page/515 515]|isbn=9780240800592 }}</ref>) need to cover a large focal plane so are made up of a number of optical lens elements to correct [[optical aberration]]s. [[Image projector]]s (such as video, movie, and slide projectors) use objective lenses that simply reverse the function of a camera lens, with lenses designed to cover a large image plane and project it at a distance onto another surface.<ref>{{cite book |title=Light Fantastic: The Art and Design of Stage Lighting |first=Max |last=Keller |editor-first=Johannes |editor-last=Weiss |page=71 |publisher=Prestel |year=1999 |isbn=9783791321622}}</ref>
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