I bought this lens to go with the Sony A57 and I am delighted with the results. Fast and accurate focusing with little need for adjusting shots in Photoshop afterwards as the quality is superb. Photographing moving subjects is no problem and I have had no vignetting even in low light conditions. On full zoom hand held I have had excellent results but a tripod would be needed I'm sure for anything less than 1/25 sec. It is a heavy lens but aren't they all? The switch between manual and autofocus is a little loose as when I put the lens in my bag it does tend to shift position so I have to remember to check it before use. I would definitely recommend this lens.