Optically, this is a spectacularly sharp lens. I am only selling it since I am not using Canon anymore (I held on to it just in case). Back when Canon made these, they used Fluorite glass, which they don't do anymore due to the expense I assume. This lens is from the end of the production run as well. If you are looking for a long lens to carry, especially to shoot landscape, you can't do better than this. It has been used, but it is clean. The glass is clean too since I always left a filter on it. Caps and hood come with it as well. As always, any dust in the rather large images is included for free! (I don't retouch them) Keh has a BGN one for $400 right now, so how about $350. Shipping will be Priority for $11 in the US.