Did you read this entire thread? I think it is pretty clear that he prefers the Canon 55-200. At least that is what I gathered after reading all of it.
I've been struggling with a decison on which affordable zoom to
buy, and based on many thing, but in-part your advice, I have
illiminated the Canon 75-300 USM IS III from that list.
What remains is the Sigma 55-200, the Sigma 70-300 APO Super Macro
II, and the Canon EF 55-200mm USM II.
I'm having a hard time deciding between the three! If YOU had to
choose, what would it be and why?
Amy
The Sigma 70-300 APO is a decent lens for the money but the canon
75-300-II III is a fringemeister with poor contrast and dismally
slow AF and USM doesn't make any difference - I sorta ignored the
55-200-II due to the silly UK new price (cheaper now at Mifsuds)
and based on my findings with the Mk1. I don't know why the AF is
so hit an miss on the Mk1 but it was even on a 1-series, the Mk2
lens coatings killed the dreaminess and CA issues, the new AF
electronics killed the AF issues and therefore softness