Canon USA has posted a new video of their ongoing series, EF Lenses 101. This time the topic is STM (Stepping Motor) lenses. These lenses are used mostly for video photography but it can be used on still shots as well.
Matt Kloskowski is the presenter and he gives some tips on using the STM lenses. Other videos on Fisheye lens and Tilt-shift lens are here. You can read my FAQ on Canon lens recommendation and see my work on MichaelDanielHo.com