Rebel T1i, D90, A550

[RexK_Cozumel]

EF are lenses designed for the Canon full frame lenses. The EF-S lenses are for their crop bodies. The EF lens will work on both full frame and crop bodies where as the EF-S will only work on the crop bodies. This is because the EF-S lenses protrude further into the body of the camera.

[Pen]

thanks a ton!