I was told by a friend that the T1i and some other Canon cameras have a shorter lens registration than the standard Canon EOS cameras. I assume then that the EF-S lenses have a shorter backfocus or registration in order to focus properly on the T1i. The registration for standard Canon EOS cameras is stated to be 44.00mm. What is the registration for the T1i ? Note: I am asking because if the registration is less than 44.00mm, then several lenses (from other manufacturers) could be mounted on this camera with an appropriate adapter that would not work on a 44mm EOS camera. Thank you for your response.