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Amazon.com : Canon EF 17-40mm f/4L USM Lens with Pro Filter。Canon EF 17-40mm F/4.0 L USM Lens - Black 4960999189949| eBay。Canon 17-40mm F4 L USM Review - YouTube。Amazon.com : Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens。商品の説明はありません