>I haven't bothered. Too finicky and requires too much time to >do it correctly for what, to me, is a very minimal gain.
Neil, you probably don't have any lenses that are far out. For me, and with 3 lenses, it was a case of adjust the lenses and enjoy them or get rid of the lenses. The problems don't show up at f11 or so but I frequently shoot wide open where it's a problem.