K&F Concept EOS-M4/3 Adapter Canon EF EF-S Lens to Micro Four Thirds MFT M43
K&F Concept lens mount adapters are all manual ones. STM lens (such as EF 50mm f/1.8 STM, EF 18-135 IS STM) requires to be powered to drive the motor to focus, so cannot achieve focus with manual adapters.