Canon STM series lenses don't work with our EOS adapters. • Canon EOS Lens. K&F Concept lens mount adapters are all manual ones. Why Choose K&F Concept？. 1X EOS-NEX Lens Mount adapter ring. 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.
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