Cameras

[lvicker585]

Will the lens that work in a T2i work in a T3i

[ebiggs1]

Yes.

[Bill-Emmett]

All Canon EOS lenses will work on your camera.  EF, and EF-S lenses. all will work.  Even lenses from third party lens companies will work, if the mount is for Canon.  Go forward, and shoot some photos.