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Has anyone considered the Fringer Contax 645 adapter? It looks pretty good w AF capabilities (but still during the development phase). Also is there a way to determine the "equivalent" focal length? The 645 being a bigger sensor, etc etc. Is this as simple as using the different equivalency formula floating around on the web? 0.64 from 645 to 35mm full frame, similar to the 0.79 from the GFX to 35mm full frame. (sorry I still think in 35mm) Dennis