Are process/flat field lenses, such as the Schneider G-Claron, Rodenstock Apo-Ro nar (contemporary) or Goerz/Schneider Artar or Red Dot Artar (classic) ok to use for taking portraits, at say 5-10 feet from the camera? I have read and heard that many large format photographers use these lenses in the field for shooting landscapes and scenics--primarily because they are smaller and lighter and thus easier to transport--but am wondering if these same lenses will deliver OPTIMAL results when focused at much closer camera-to-subject distances, such as in a p ortrait situation, in both a studio setting as well as on location. Some people have told me that the flat field lens is designed for producing optimal results ONLY at 1:1 (and moreover, only at f/22); others have told me that this is not t rue, and that a good "copy" or "process" or "flat field" lens--as long as it is of good quality--will work excellently at any focused distance (and at several a peratures of f/22 and smaller). I am more aware of the latter group defending th ese lenses in their use for infinity-work (ie for landscapes, vistas, scenics et c) than for all the focused distances BETWEEN infinity and 1:1, such as would be encountered in a half-figure portrait at 5 feet, for example. To that end, I wo uld be interested in hearing from anyone who has used the process lens for porta iture, not just for scenics. Is the process lens for this use just as good--ie j ust as sharp--as a "standard-design lens", such as the Rodenstock Sironar N or S or the Schneider Apo-Symmar? Or would the "standard-design lens" perform bette r than a flat-field lens for portaiture? Or, on the other hand, would the flat- field lens--precisely because it is optimized for 1:1 work--actually yield SHARP ER pictures than the standard-design lens, at such close distances? Finally, of all the process/flat-field/copy lenses available, which in your opinion do you think are the best (the sharpest, yielding the best tonality etc) or which do yo u like the best--taking into account of course the ultimate subjectivity of all such judgments. I will be using this lens primarily for 4 x 5 work as a long le ns (but possibly for 8 x 10 too) for photographing people--and am considering fo cal lengths of between about 300mm and 480mm.