優點:
(1) The range is extremely useful. 17mm for view. 85mm for human head or upper body photos taking.
(2) The structure is very solid.
(3) IS is really useful. I tried to turn off the IS to take a photos, and then turn on the IS to take a same view photos. The different is pretty obvious.
(4) Good looking for puting in 450D.
(5) Have IS and USM at the same time. It is difficult to have both in non-L lens. Therefore, it is very good to have two both at the same time.
缺點:
(1) No ED lens inside, it make people no confidence about it.
(2) A little bit heavy, but I think it is normal.
評價:
I have just bought it, and put it on my new 450D. It make the 450D more good looking. Before, I bought it, I really did not have confidence about it, because it have no ED element, I was afraid the sharpness being compromised. After I used it, I found it have no obvious different with Canon 17-55 which I bought in 2006 with Canon 40D. The quality of picture is really out of my expection. The mark I must give it is five Star. Therefore, I do not know why people always say it not good enough, specially, it's sharpness. It is really good, so I must defence for it. Try it before you wonder it's quality.