Edmund Optics has recently published a set of articles about evaluating imaging system performance. Abridged versions can be found online: http://www.edmundoptics.com/TechSupport/DisplayArticle.cfm?articleid=249 The MTF targets look very interesting because they assess both resolution and contrast at the same time. http://www.edmundoptics.com/techSupport/DisplayArticle.cfm?articleid=248 But they sell and support all kinds of targets. Maybe we could ask them for support on this task? Chris Mahanna