Review on Sigma 50-500mm f/4.5-6.3 APO DG OS HSM SLD Lens for Canon DSLR Camera - Ultimate Ultra Telephoto Zoom Lens by James Cash

I bought this lens to use with my Canon 60D. So far I've taken some AMAZING shots of everything from alligators to moths. I have very little negative to say about it. Love the fact that it comes with its own very padded carry case along with two hoods. The build seems excellent (with one exception below) and I haven't had any issues with auto or manual focus that I think a few other people have noticed. My only complaint is the lock switch, which is used to prevent the lens from being retracted. I have issues with it being difficult to unlock when downward pressure is applied to the lens. So if it's pointing at the ground when you try to unlock it, the latch will engage and you'll have to tilt the lens up to unlock it. Note that it is HARD (which is to be expected). Running 4-5 hours with it on your neck or shoulder along with a backpack is a workout. But what can I say, you get such a lens and what can you really expect. Especially because you can take great pictures without a tripod. I would ABSOLUTELY make this purchase again! Update: Next month it's been four years since I bought this lens. He's still taking great photos, even after two years in harsh East African conditions and a month hiking in India. It remains a good buy.