IF you can ever find one, a Goerz WA Dagor 4 3/8" (110 mm) f8 is a fantastic little lens. Slim enough to stay on the camera when closed up on just about everything out there in a field camera. It will cover 5x7 with very limited movement, or 4x5 with generous movement. Weighs next to nothing. I got really lucky when I bought mine - I guess nobody was watching for one that day, as I paid $100 for it. Wider than that, I'm partial to the Rodenstock 90 and 75 f6.8 models. Just a little slower than the 5.6 versions, but very large image circles, still brighter than the f8 versions, and both take a 67mm filter, which is nice since that is the filter 3/4 of my 4x5 lenses use. The only two that don't take that size are my Sinaron 150 and my 4 3/8" WA Dagor. In the long run, you really can't go wrong with anything from the big four (Schneider, Rodenstock, Nikon, Fuji).