sigma 500 f:4,5 HSM APO

[tonno1970]

Hi all, anyone using this lens (the Sigma prime 500 f 4,5 APO HSM)? I read a lot of good things on it but I'd like to have a thought from people with my same hobby.

Yes canon is better but is double the price.... from a big starting price...

thanks for your help

Ciao Giampaolo