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Amazon.com : KIPON Focal Reducer Optics Adapter for Using Mamiya 645 Mount Lens on Leica L SL TL Mount Camera : Electronics
Epic mediumformat lenses on your mirrorless camera. Kipon Baveyes Mamiya 645 Speedbooster - YouTube
Kipon Adapter Focal Reducer Speedbooster for Contax 645 Lens to Fuji GFX Camera | eBay
Amazon.com: XPIMAGE Speed Booster M645-GFX 0.71 Anillo adaptador de montaje de lente reductor compatible con Mamiya M645 645 Phase Schneider lente de formato medio a cámara digital sin espejo Fujifilm GFX :
Kipon Baveyes Adapter for Mamiya 645 Mount Lens to Canon EOS R Mount Camera KP-LA-BE-EOSR-MY645