Is anyone aware of Linhof tested lenses? Apparently, Linhof buys batches of len ses from Schneider and Rondenstock and tests them. Those lenses that meets Linh of's own set of criteria are inscribed LINHOF on the barrel. I have seen three such samples myself but I am wary of the hypothesis that these are premium sampl es of any one production run of lenses from Schneider or Rodenstock. Can any re aders please advise. Thanks.