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1 EF-S lenses feature a protective pin that stops these lenses from being mounted on a full-frame EOS camera.  EF-M â a new lens format specifically designed for the Canon EOS M mirrorless camera system with EF-M mount. Just like the EF-S lenses, EF-M are designed for APS-C sensor cameras.
FD and EF are the lens mount types. FD was Canon's older lens mount style, used on cameras like the F-1 and AE-1 (among many others). FD is not known to stand for anything. EF is the newer lens mount, introduced with the Canon EOS cameras in 1987. EF stands for Electro-Focus. Your Rebel XTi has an EF-S lens mount.