[xyzeric]

你會選擇那一支呢？
前者L鏡相信好多人用，但是後者有朋友選用嗎？質素如何呢？

[fycheung]

Optical quality, no doubt it is L lens.

For convenient, 17-85 IS is the first choice. The chrome aberation is bad at edge of 17mm. Color production is worse than L lens. "IS" and the range are the saling points. I accept its quality for its convenient.

[fycheung]

Optical quality, no doubt it is L lens.

For convenient, 17-85 IS is the first choice. The chrome aberation is bad at edge of 17mm. Color production is worse than L lens. "IS" and the range are the saling points. I accept its quality for its convenient.

[老叟]

單講質素成像,梗係L鏡啦!!

[ngwailung]

我寧願先買17-85 IS，再儲錢買支28-70L或16-35L。

首先，L鏡的優勢在於大光圈下仍有清晰影像，變形控制更佳，邊沿影像清晰；不過，在1.6x的APS-C格式加上f4較細光圈下，17-40L與17-85 IS的差別並不太大，除非你放大100%比較才找到分別。在低光的環境如室內拍照，17-85 IS有防震，反而比17-40L更能拍出清晰影像，而且焦距更大亦更有彈性。

不是說L鏡一無是處，事實上我只是認為17-40L賣$5280，反而16-35L焦距更短卻賣$10380，不是沒有原因，主要便是因為後者光圈更大，要拍出淺景深或在空內低光環境下更有優勢。

[Philippe]

17-40L係一支晴天鏡.如果你買DSLR淨係影大好天咁其實用DC效果唔係差好遠.不過大多數人都有個L情意結.而呢支鏡又好容易滿足到預算有限的用家,所以咁受歡形.

[man1492]

"17-40L係一支晴天鏡.如果你買DSLR淨係影大好天咁其實用DC效果唔係差好遠"

Detail 遠高於DC，不過當然係50-100% crop.
如果係大好天既話，收一收光圈，喱支L lens 同 kit lens 唔差好遠，用在APS-C上。