To be honest use that lens as a paper weight and get a DSLR with a kit lens in that focal length range. Quantaray are low end junk made for certain camera store chains. They are the lowest end Sigma lenses that are slow focusing, noisy, and have poor quality glass in them. The newer lower end dslr will really show the poor performance of the lens to the point you might think the camera is the problem.
So in short, get a kit lens with whatever dslr you get.