Sigma 18-250mm f3.5-6.3 DC Macro OS HSM for Canon (883101) (Certified Refurbished) Sigma USA Authorized Dealer, 4-Year Sigma USA Warranty Covering wide angle 18mm to telephoto 250mm, this versatile lens designed exclusively for digital SLR cameras, is suitable for all-purpose photography including landscape, sport, and macro photography. It is convenient when you wish to keep your equipment to a minimum and yet still be prepared for all opportunities and situations, such as travels. Special Low Dispersion (SLD) glass element with three aspherical lenses, including a double-sided aspherical lens, have been used in the lens' construction--offering excellent correction of color aberration, for better clarity and quality of images throughout the zoom range. Super Multi-Layer Coating has also been employed to reduce flare and ghosting with this lens. This makes it resistant to strong incident light, such as backlight behind a subject, providing sharper, high contrast images even shooting into a light source. Close-up capability is improved with the minimum focusing distance of 13.8" throughout the entire zoom range, and maximum magnification ratio of 1:2.9. In APS-C size equivalent, macro photography with approximately 1:2 magnification ratio is possible.