[curtisltc]

本人昨天買了 canon 17-40mm 鏡頭，　配上　canon 400d body, 　好似沒有想像中好．．．．是否浪費了支鏡頭嗎？

[Obi-Wan]

是否浪費了支鏡頭嗎？

Yes, I never use 17-40 on 20D-50D after buying 10-22mm as 17-40 is not wide enough on APS-C canon (I primary use it on 5D2, but the quality is not any better than 10-22 on 50D)

NO, u have a reason to upgrade to FF to use this lens! ^_^