Image: Double-porro-prism
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Double-porro-prism.png (400 × 261 pixels, file size: 11 KB, MIME type: image/png)
Description: Combination of porro prisms used in binoculars
Title: Double-porro-prism
Credit: en:Image:Double-porro-prism.png in en-wiki, licensed under GNU FDL
Author: en:User:DrBob
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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