Over a year ago I discovered quite by accident this neat technique of stopping down (changing the aperture) of a Canon EF lens for use with my Letus35 Extreme. Since then a number of people have asked me how to do this while almost everyone else was surprised that one could use Canon EF lenses with their 35mm adapter and have the option to stop down these lenses in order to control exposure and/or Depth Of Field.
So I decided to make a video tutorial on just how to do this.