Liked your pics. I am about to make the decision about the Sigma to go with my new Nikon D80. Looked at the Tamron also which is on sale second-hand at 340 in Dublin but don’t think it will get my vote as I hear that Tamron have a bad track record if anything goes wrong. Your pics show good use. I also want to be able to go from wide angle to telephoto of birds and also close ups of flowers. Don’t want much do I!! Good luck.