Looking at replacing a Nikkor f/3.5-5.6 18-55mm DX kit lens with something a bit faster and less prone to shoot non-existent fog on very bright Texas summer days. The Sigma 18-50mm EX DC (APS-C) non-IS model is just about right for what I do. The camera is a trusty Nikon D50 - which I'm loath to let go at the prices they're fetching these days!