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Monocular Lens, Clear Images 180X Magnification 6.5:1 Zoom Ratio Alloy Microscope Camera Lens for Electronics for Industry: Amazon.co.uk: Electronics & Photo
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What is 1:1 Macro Magnification Ratio? Explained Simply, with Examples | Macro Photography - YouTube
Magnification ratio / minimum focus distance: Camera, Lens and System Buying Advice Forum: Digital Photography Review
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