Hi Kevin,

An excellent site is Pentax Forums in the USA where they have done various comparisons. Don't do what I did and that is buy a Metz 45 CL - 4 unless it is a digital version, which mine isn't. I am seriously considering the Metz 58 AF - 2 over the Sigma 610 DG Super.

What you have to remember is that it is like tripods, if you buy a cheap one you keep upgrading and it ends up costing you more than what it would have to get the good one in the first place.

Regards,
Gordon.