No. The EF-S lenses only work with the the small sensor like the T1i has, APS-C I think. Your camera is compatible with both the EF and the EF-S lenses. The lenses with the the 'L' designation are the highest quality. For third party lenses there are some good ones. Look at Bryan's reviews. One that I have is the Tamron SP AF 17-50mm f/2.8 XR Di II LD IF . Very good image quality for a good proce.


For your camera I suggest you start with Bryan's review. You will find you made an excellant choice in buying the T1i.


Mark