Introduction The new Canon EF 40mm f/2.8 lens is the second one that Canon has equipped with its new Stepping Motor Technology (STM) system that allows that allows not just fingertip editing, but also the ability to provide continuous tracking of moving objects both rapidly and quietly, making it perfectly able to answer the exigencies of video. According to Canon, this type of motor eliminates the “pump effect” that one sometimes encounters with other systems.Videographers will particularly appreciate its quietness, along with its electro-magnetic diaphragm (EMD) that allows for accurate
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