Micro 4/3 to EF Adapter

thingiverse

This adapter works seamlessly with both EF and EF-S lenses. The difference between the flange distance of M4/3 and Canon EF is a significant 24.75mm, making this part a key dimension. The EF mount was largely modeled after existing extension tubes on Thingiverse, while the M4/3 mount was based off existing M4/3 adapters, with some trial and error thrown in for good measure. A technical drawing featuring all critical dimensions is available, allowing you to create more adapters if desired. If you're looking to design adapters for the Micro 4/3 mount, I can provide part files and guidance on designing them. The locking pin recess should work perfectly on most M4/3 cameras; I've personally verified that it works on a Panasonic GH4/5. Update 6/6/2016: I've added a locking pin for the EF side of the adapter, which functions by first attaching the EF lens to the adapter, then inserting the locking pin, and finally attaching the adapter to the MFT camera. The pin will remain in place when the adapter is attached to the camera, eliminating the need for a spring-loaded pin and release mechanism. This design was suggested to me by Wisnaeme (https://www.thingiverse.com/Wisnaeme), and it's a brilliant solution that I wouldn't have come up with on my own. The part files for the updated design are mftef locking pin cut.stl (the main adapter body) and mftef locking pin.stl (the locking pin itself). There's also an option to print a file without the pin and glue in a metal rod (2mm) for a stronger locking pin. Print Settings: Printer Brand: LulzBot, Printer: Mini, Rafts: Doesn't Matter, Supports: No, Resolution: .2, Infill: 20%, Notes: For best results, the adapter should be printed EF side down.