[carmenchan]

Sigma 70-300mm F4-5.6 DG MACRO
Sigma 18-200mm F3.5-6.3 EX DC
可否比D意見邊究定支好!

[Round]

As many similar posts, you need to provide a bit more on what exactly you want to use the lens for.

Your question is now just like, should I go for a desktop or a laptop.

[tam_dominic]

70-300 有macro for insects shots
18-200 有wide zoom for interior and large scenic shots.

It is up to you to decide :-)

[poodlebb]

兩支鏡我都有，個用途真係好唔同架。如果係for平時旅行或乜都影下就18-200，你要tele加macro就70-300。

[PamWong]

I tested Sigma 70-300 and then ended up buying Canon's 75-300 because it focus faster and easier to zoom (Sigma is too stiff for me). Consider Canon's 75-300 la - there is not much price difference! It does an excellent job for it's price.