Tests were run at variable working distances from the target for each focal length so that the target filled the viewfinder. An Edmund Scientific lens resolution chart was illuminated with a tungsten modeling bulb from a monolight flash. The cameras were mounted on a Bogen 3033/Arca Swiss B1 tripod/head combination with a large Kirk bean bag weighing down the tripod/head to dampen vibration. Two exposures were shot using mirror lockup and aperture priority exposure at +1 exposure compensation with a cable shutter release at ISO 100 in large jpg mode. Custom white balance was selected using a grey card. The central autofocus point was centered over the center pattern for each exposure. Exposures were taken with the lens aperture fully opened and at f/8. Results were comparable at both apertures and final analysis is reported/shown for the f/8 exposure.