Canon EF-S 55-250mm f/4-5.6 IS Image Stabilizer Lens for Canon Digital SLR Focal Length & Maximum Aperture: 55-250mm f/4-5.6 Lens Construction 12 elements in 10 groups, including one UD-glass element Focus Adjustment DC motor, gear-driven (front focusing design), Closest Focusing Distance 3.6 ft./1.1m (maximum close-up magnification 0.31x) Filter Size 58mm