dude, I got some good news for you.
Voigtlander came out with a 15mm M mounted lens!
see here:
http://www.clubsnap.com/forums/showthread.php?t=486890
& I think this would be quite handy for the bessa T. 15-35mm zoom finder!
see here:
http://www.clubsnap.com/forums/showthread.php?t=486901