This lens had plenty of good comments on the web, so finally decided to give a try, as I have wanted a shorter zoom to bring with 400mm or 500mm lens,
It is indeed a pretty good lens for its price, light weight, relatively long in focal length for its physical size,
however, I find that it is too slow for flying birds that comes from ahead, it is only good enough for birds moving from left or right, (less demanding on focusing for any lens)
with some concentration and paitence, it is still capable of delivering good shots........
I got it after the price had increased at 4500, but it is good for the small price tag, and be used as part time bird lens.