So I can't use it with the Rebel XT. Picking out a lens is hard work!
*OS system can be used with Nikon cameras, which are only compatible with image blurring compensation mechanism. It can be used with following cameras. F6 and F100, F80/N80 series - F65/U, F75/U2, D2H, and D1 series, D100, D70 and Fuji Film FinePix S2 Pr
S mechanism cannot be used with other camera models.In addition, OS mechanism and Auto Focus operation of this lens do not work with F5 cameras.