Thanks eveyone for your comments.
Sighman, i am extremely pleased with this lens, and since i bought this in January i have used nothing else, i love it. I have the OS on all the time, and have been happy with the results of my photos. I wanted a lens for travelling, and this lens was what i was looking for. Although i have a Canon camera, the cost of the canon lens was a lot more than the siggy, and watching the pennies, it was the siggy that won. It is a sturdy made lens, and i thought it would be heavier than it is, but i was surprised, although the barrel can be a little bit stiff turning from 50 - 80mm but i am now used to it. I actually tried this lens on my camera in the shop before purchasing it and i know it was meant for me.
Hugo, yes all my photos are hand-held, i have not used my tripod yet. I personally think you first two photos are fine its the last one that i think is not so sharp. sue
sigma 18-200 os lens
All my photos are clickable