Macro Canon Eos

Macro Canon Eos
It is Sigma 17-70mm f/2.8-4.5 DC Macro lens good a Canon Eos 450D?

It is not really better than the lens you probably already have (18-55mm). Stick with Canon if possible. And if you want a different purpose, do not buy anything that duplicates what you already have unless you go for a major upgrade this objective Sigma is not.

Canon EOS 500D Tutorial Video 8 – Macro Mode