{"title":"Zoom Lenses","description":"\u003cp\u003eA zoom lens is a system of \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Camera_lens\" title=\"Camera lens\"\u003ecamera lens\u003c\/a\u003e elements for which the \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Focal_length\" title=\"Focal length\"\u003efocal length\u003c\/a\u003e (and thus \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Angle_of_view\" class=\"mw-redirect\" title=\"Angle of view\"\u003eangle of view\u003c\/a\u003e) can be varied, as opposed to a fixed-focal-length (FFL) lens (\u003ci\u003e\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Prime_lens\" title=\"Prime lens\"\u003eprime lens\u003c\/a\u003e\u003c\/i\u003e).\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"anchor\" id=\"Optical_zoom_lens\"\u003e\u003c\/span\u003e\u003cspan class=\"anchor\" id=\"Optical_zoom\"\u003e\u003c\/span\u003eA true zoom lens or optical zoom lens is a type of \u003ci\u003e\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Parfocal_lens\" title=\"Parfocal lens\"\u003eparfocal lens\u003c\/a\u003e\u003c\/i\u003e, one that maintains focus when its focal length changes.\u003csup id=\"cite_ref-1\" class=\"reference\"\u003e\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Zoom_lens#cite_note-1\"\u003e[1]\u003c\/a\u003e\u003c\/sup\u003e Most consumer zoom lenses do not maintain perfect focus, but are still nearly parfocal. Most \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Camera_phone\" title=\"Camera phone\"\u003ecamera phones\u003c\/a\u003e that are advertised as having optical zoom actually use a few cameras of different but fixed focal length, combined with \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Digital_zoom\" title=\"Digital zoom\"\u003edigital zoom\u003c\/a\u003e to make a hybrid system.\u003c\/p\u003e\n\u003cfigure class=\"mw-default-size\" typeof=\"mw:File\/Thumb\"\u003e\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/File:Austrian_Bowl_2013-218.JPG\" class=\"mw-file-description\"\u003e\u003cimg src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/3\/39\/Austrian_Bowl_2013-218.JPG\/220px-Austrian_Bowl_2013-218.JPG\" decoding=\"async\" width=\"220\" height=\"146\" class=\"mw-file-element\" srcset=\"\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/3\/39\/Austrian_Bowl_2013-218.JPG\/330px-Austrian_Bowl_2013-218.JPG 1.5x, \/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/3\/39\/Austrian_Bowl_2013-218.JPG\/440px-Austrian_Bowl_2013-218.JPG 2x\" data-file-width=\"4288\" data-file-height=\"2848\"\u003e\u003c\/a\u003e\n\u003cfigcaption\u003eTV camera and \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/List_of_Canon_products\" title=\"List of Canon products\"\u003eCanon DIGI SUPER 86 II\u003c\/a\u003e zoom lens with 86× magnification\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cp\u003eThe convenience of variable focal length comes at the cost of complexity – and some compromises on image quality, weight, dimensions, aperture, autofocus performance, and cost. For example, all zoom lenses suffer from at least slight, if not considerable, loss of image resolution at their maximum \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Aperture\" title=\"Aperture\"\u003eaperture\u003c\/a\u003e, especially at the extremes of their focal length range. This effect is evident in the corners of the image, when displayed in a large format or high resolution. The greater the range of focal length a zoom lens offers, the more exaggerated these compromises must become.\u003csup id=\"cite_ref-2\" class=\"reference\"\u003e\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Zoom_lens#cite_note-2\"\u003e[2]\u003c\/a\u003e\u003c\/sup\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c!----\u003e\u003c\/strong\u003e\u003c\/p\u003e","products":[],"url":"https:\/\/www.wow-optic.com\/collections\/zoom-lenses.oembed","provider":"WOW Optic","version":"1.0","type":"link"}