If you've been on the lookout for a lens that will absolutely change the character and emphasis of the subjects you shoot, plus give you flexibility in framing options that you just can't get any other way, you need to start experimenting with this Sigma Photo 8-16mm f/4.5-5.6 ultra-wide-angle zoom lens. With a 12mm equivalent focal length on most APS-C cameras at full wide angle, this lens is ideal for capturing that seaside panorama with the approaching storm clouds, or the full city skyline from the high ground downtown. Plus, with the unusual emphasis that extreme wide angles give to perspective, you'll be able to create images that are truly arresting.
Emphasis on foreground subjects, relative to their backgrounds, is a specialty of lenses like these. Try it out in tight interior spaces as well for a roomy feel in cozy quarters.