So I just borrowed a friends Canon 75-300mm lens, and I know it's probably not the best lens, but it kicks the shit out of my kit lens. I'd like to find a similar lens, but don't know how Canon measures up with Tamron. I checked eBay, and I see some Canon and Tamron, and the Tamron says "AF" and the Canon says "EF". If it's auto focus, then does that mean that it is auto focus only? Or is there still manual focus? Sorry, still a noob. I found some decent 75-300mm lenses for under $200, so I think I might get one soon so I've got something to replace my kit lens.