Joseph Wei , Aug 15, 2006; 08:36 p.m.
I've had a lot of excellent results with the Vivitar Series 1 lenses for Canon FD (I have the 70-210mm f/3.5, 62mm filter size version and the 35-85mm f/2.8). The Tokina ATX lenses are also reportedly very good. Both of these lenses now go for very reasonable prices. Sigma and Tamron are also worth looking into, but I've heard mixed reviews about these lines.