[swordmanhill]

各位前輩,小弟系初級玩家，打算入350D同17-40/f4 L or 17-85/f4-5.6 IS 呢兩支既其中一支，各位前輩有咩TIPS，邊支鏡同350D夾D，會吾會有失焦既情況出現？

重想問多句，其實L鏡既成像質量系米真系會好過非L鏡好多？

多謝賜教，不勝感激！！！！

[ngwailung]

就你幾個問題，一定係17-85IS同350D夾D，失焦來說，都會係17-85IS好D，據我所知EF-S鏡好少失焦。

其實17-40L的焦段比kit lens還要短，對初學者未必太有用，反而17-85IS可用性就高好多，加上有IS，我看是不二之選。其實論質素，17-40L可能會好少少，但少到你幾乎分不出，最好看看一些sample自己作決定啦。

[nlsho]

17~85啦。
ISO800 + IS，有排都唔駛買燈。
估你冇耐又會想要埋小小白，兩支都67mm，方便?。

[swordmanhill]

多謝上邊兩位師兄賜教，其實我都傾向于17-85，因為對我來將，有IS始終好好多，但是驚成像質量會同L鏡差太多。

BTW，小小白是指邊支鏡？

[ckso]

Agree

[blackhawkchan]

If you want good quality, I perfer 17-40 F4L.
I think "IS" is not too important in this range.

[beancurdbean]

我會揀17-85 IS

[nlsho]

小小白 = 70~200/4L

[wlachan]

17-85 +1

[man1492]

"I think "IS" is not too important in this range."

1/3 sec @ wide open
1/10 sec @ 50mm
1/15 sec @ 85mm

If you got a machine arm, you can forget these.....

[eos1dmark2]

According to my experience with 17-85 IS, IS is very useful in dim situations!

[swordmanhill]

其實有無D副廠鏡會有IS功能呢？

[variosonnar]

有！Sigma支80-400長鏡有防震功能（叫OS，即Optical Stabilizer）