Well, I received my 300 f2.8 AIS today, and for $500, I am pretty thrilled! The glass is absolutely spotless (and no dust inside). The diaphragm is pretty snappy and the focusing is very smooth. The body is definitely used, but overall in good shape. The only thing I have noticed is that the aperture ring is a bit "sticky." If I squeeze at all while trying to turn it it doesn't want to go. If I use a light touch it is fine. What do you think? Something I can remedy at home? Something to just live with? A CLA? Question 2 while I have your attention, do you know where can I get a "leather" hood for this lens? How about a 122mm protective filter? Thanks for any insight in advance. I sure am excited about getting out and shooting with it this weekend!