clipped from: digital-photography-school.com   
Wide-Angle-Lens-16Photo by wvs - 10mm
Wide-Angle-Lens-1-1Photo by petecarr - 10mm
Wide-Angle-Lens-14-1Photo by 10 Ninjas Steve - 11mm
Wide-Angle-Lens-2-1Photo by wildpianist
Wide-Angle-Lens-3-1Photo by Jrtippins - 10mm
Wide-Angle-Lens-10-1Photo by gari.baldi - 10-20mm
Wide-Angle-Lens-11-1Photo by gari.baldi - 10mm
Wide-Angle-Lens-12-1Photo by antiguan_life