擷取photozone對於兩隻鏡頭, 結論的第一句話.. 15-85: The Canon EF-S 15-85mm f/3.5-5.6 USM IS is certainly a desirable lens ... if you can get a good one (ours had a bit of QC issue). 18-135: The Canon EF-S 18-135mm f/3.5-5.6 IS may be somewhat better than the EF-S 18-200mm f/3.5-5.6 IS but it's not exactly a good lens either.