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Amazon.com : MEKE 8mm T2.9 Large Aperture Manual Focus Prime Low Distortion 4K Mini Cine Lens for Micro Four Thirds M4/3 MFT Compatible with Olympus/Panasonic Lumix Cameras and BMPCC 4K Zcam E2
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Why does focal length double when using a vintage lens adapted to a micro 4/ 3 digital camera? - Quora
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