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Amazon.com : Nikon AF-S DX Micro-NIKKOR 40mm f/2.8G Close-up Lens for Nikon DSLR Cameras : Digital Slr Camera Lenses : Electronics
Canon 40mm f/2.8 STM Pancake EF-Mount Lens, Black {52} at KEH Camera
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Amazon.com : Canon Cameras US 6310B002 EF 40mm f/2.8 STM Lens - Fixed Black : Camera Lenses : Electronics
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File:Canon EF 40mm STM lens (focus stacked version).jpg - Wikimedia Commons
