Congratulations on the trade. According to Rollei history, the T was invented to compete with an exploding camera market and is designed to be able to use 35mm and 645. Also according to what I have read, the T was discontinued at some point but then the British Military wanted it and so Rollei made another run of them with the Schneider Xenar rather than the Zeiss Tessar. The Xenar is just as good a lens as the Tessar, just as also the Schneider Xenotar is just as good as the Zeiss Planar. According to the famed repairman Krikor, the weakness of the T is in the transport so it must not be abused. Apparently the parts to repair the transport are hard to find. Lots of T lovers in the world.