I'd like to quote Mattheson from Der vollkommene Capellmeister. In his foreword (I read from [the english translation][1] that's close to impossible to get hold of these days. Publishers take note: this book requires a reprint!) he writes:
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In France they say:
Peter Spiro wrote an article making the argument to use Nikkor lenses on Canon EOS cameras. It fits nicely with the manual focus argument I've been making. Out of special interest, he has copied a table comparing 50mm lenses. I've decided NOT to go for a Canon ...
Haje Jan Kamps has written a great article on macro photography. Not quite pinhole, but that direction