I have the Series 1 70-210 f3.5 zoom the second version made by Tokina in Canon FD fitting, the Image quality is wonderful, and the I.Q will give most of the Camera manufacturers marque lenses a run for their money,, which was what the Series 1 range were designed to do, indeed I have the Canon FD 20-210 lens but the S1 is better, the build quality is first class, the only drawback is because they have all metal barrels they are quite heavy.