So I got my first new Canon lens that isn't the 18-55is. 50mm 1.4. I have never used a USM before so is there a clutch inside? I noticed that when manually focusing, if I got until it stops, I can go further and keep going. Is this bad for it if it is normal? Also, when manually overriding the AF, is that mostly on Single shot focus? I noticed on continuous focus it keeps focusing even if I hold the ring, and if I try turning it out of focus it just finds the focus again. Anyways, I am excited. I mean to put it at 5.6-8 and test it against the kit lens to see what it really offers optically. The obvious faster aperture is what I wanted though, and I must say, the shallow DOF backgrounds are smooth as silk imo.