We all know that the magnetic pickups mounted on our guitars sense the vibration of each string. However, the details of this often elude us. In fact, the pickup “looks” at merely a portion of the length of the string – just like a camera in the optical domain, the pickup has an “aperture”. This may have consequences on the sound generated by the pickup, and the present article sheds some light on that issue. Because the way the magnetic field is shaped, the aperture is also dependent on the distance the pickup has to the string (i.e. the “height” of the pickup), and thus we also get some info about how adjusting the pickup really influences the sound.  Check out the article on the aperture of the pickup here!