I recently borrowed a Silverfast resolution target to measure the performance of my scanners. The target is a slide that is printed with a series of black bars which get progressively smaller and closer together (the pattern is based on the USAF-1951 test pattern). The slide costs approximately $60 at B&H Photo. You scan the target and read off the group and element number where the gap between the bars is just discernable. Based on the group/element you look up the resolution from a chart. My ...