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M42 42mm lens mount adapter to Nikon D3100 D3000 D5000 Infinity focus DC305 Y5H9 191466727928 | eBay
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Amazon.com : Nikon D3100 14.2MP Digital SLR Double-Zoom Lens Kit with 18-55mm and 55-200mm DX Zoom Lenses (Black) (Discontinued by Manufacturer) : Slr Digital Cameras : Electronics
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