One of the most important specs for large format lenses seems to be the image circle size. The coverage at f22 seems to be a prime benchmark for choosing between lenses. Over the years my lenses have grown smaller, lighter and have smaller coverage. I started out with a 210 Symmar S, which has served me very well. Several years ago I added a 200M Nikor. The Symmar covers almost 300mm at f22. The Nikon, a Tessar design, covers only 210mm. I have not found that to be a constraint in my field work. My shorter lens, a 135 Nikon W, covers about 200mm, which has not been a problem, either. My tightest lens is the 105 Fujinon W, which at 162mm barely covers a 4x5 negative. I rarely use that wide of a lens, but on the few occasions when I have used it the coverage has seemed adequate. I would like to hear some other people's thoughts and experiences in this area.