共12页, interesting comparison
http://photography-on-the.net/forum/showthread.php?t=799955

你额1585 裸镜吗？上了滤镜否

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=675&Camera=474&Sample=0&FLI=0&API=1&LensComp=679&CameraComp=474&SampleComp=0&FLIComp=0&APIComp=2

从这个网站来看，15-85远远好于另外2个镜头，看来这些镜头的个体差异非常大

B005的确可以啊

我怎么觉得，1585从测评参数上看高于1740，可实际拍摄上看却和28-105一个水平呢。。。。

100% crop

85mm端最大光圈。

这张是85mm端的，不过由于手抖就不放100％截图，那个焦外倒是很舒服。

100％ crop。弄得不是很好，凑合吧。

某天在广州颐高数码城外面的佳能展示活动那里，拿起一台7D+15-85随手试拍了两张。RAW经DPP默认处理转JPG。参数基本都写在边框上了，焦距是15mm。

I'm not saying 17-85 or 15-85 are bad, but remember that 17-85 was very expensive as well? :-)

sorry can't type Chinese on this PC
I don't think 15-85 is that bad, maybe his copy is not very good.

But it's no surprise that 17-50 VC has better picture quality than 15-85, specially at 100% crop, many reasons :

1) 15-85 has more focal range, 2mm more at the wide end, and 35mm at the long end. Of course the more range , the more compromise has to be made in terms of picture quality.

2) 15-85 is mostly a daytime walkaround lens : fast USM, good focal range, not the best PQ (picture quality)

3) to be fair, 17-50 VC should be compared to 17-55 IS

4) the camera is a 7D with 18M pixels!!! it will reveal the limitation of a lens at 100% crop more clearly than a 40D or 450D

貌似15-85成像很烂的说，谁手里有贴个100%crop？ 我觉得佳能不应该把成像那么烂的头卖那么贵吧。