SIGMA AUTHORIZED DEALER With FULL Warranty. INCLUDES BONUS Sandisk 64GB Extreme SD Memory UHS-I Card w/ 90/60MB/s Read/Write. ALSO INCLUDES Petal-Type Lens Hood, Front and Rear Lens Cap, 1 year America Warranty + 3 year USA extended warranty on manufacturing and workmanship for a total of 4 years of coverage from date of purchase. 18-35mm FOCAL LENGTH, 27-52.5mm equivalent focal length on APS-C cameras. F1.8 MAXIMUM APERTURE; F16 minimum.