During the width tests it appeared that the 14-54mm Zuiko focal lengths might be off a bit from those set. This was judged simply by the field widths. Actually, one can compute the magnification from the observed field width and knowing that the sensor on the Olympus E-330 is 17.3mm in width. If the distance from the object (yard stick) to the sensor (or focal) plane of the camera is measured, one can determine the focal length by a simple computation. Here, I show the data pictures for both lenses and finish with a table of computed focal lengths.