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(definition), §3.5 (image position)","basis":"rated","bound":null,"mode":null,"conditions":null,"sources":[{"url":"https://www.projectorcentral.com/ViewSonic-LS550WH-LED-Projector-Review.htm","title":"ViewSonic LS550WH WXGA Short Throw LED Projector Review (ProjectorCentral)","kind":"review","quote":"the LS550WH doesn't offer optical zoom or lens shift"}]},{"key":"optics.throw_ratio","label":"Throw ratio","value":{"min":0.49,"max":0.49},"unit":":1","standard":"ISO/IEC 21118 item 9, §3.6","basis":"rated","bound":null,"mode":null,"conditions":null,"sources":[{"url":"https://www.viewsonic.com/us/ls550wh-3000-lumens-wxga-short-throw-led-projector-w-125-rec-709.html","title":"ViewSonic LS550WH product page (US)","kind":"manufacturer_spec_page","quote":"Throw Ratio : 0.49"}]},{"key":"optics.zoom","label":"Zoom","value":"digital","unit":null,"standard":"ISO/IEC 21118 Table 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