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Zoom lens - Wikipedia
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Figure 1-38.Variable focal-length (zoom) lens
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Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
Equivalent Focal Length :: VIVOTEK ::
Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
zoom - Is it exactly true that doubling the focal length makes everything look twice as big? - Photography Stack Exchange
