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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:12, 21 January 2010 | 867 × 406 (13 KB) | Markdaams | {{Information |Description={{en|1=Diagram showing why two lenses, with different focal lengths but the same aperture setting, will produce the same illumination in the focal plane.}} |Source={{own}} |Author=Markdaams |Date= |Permission= |
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