Sigma 10-20mm f/4-5.6 EX DC Wide Angle AF Lens & Filters & Close-Up Macro Set & 7 Year Warranty for Pentax SLR Three Aspherical lens elements offer excellent correction for distortion and Three SLD (Special Low Dispersion) glass elements employed for effective compensation of color aberration Internal Focusing System allows the convenient use of a polarizing filter for creative effects &amp; improves the optical performance of the lens at various distances Awarded the TIPA award, best consumer lens in Europe '2009 Kit includes: 7 year warranty extension, Opteka 3 Piece Filter kit and a 5 piece lens cleaning kit