Canon has recently issued a product advisory for the new EF 40mm f/2.8 STM lens. It has been confirmed that the autofocusing function of the EF40mm f/2.8 STM lens, which was released in June 2012, may not operate correctly. You can fix the autofocusing problem simply by removing the lens from the camera and reattach it. The company will release a new firmware update to fix this problem. [PhotographyBay]
