Designed to provide all levels of non-professional EOS SLR users with Canon's superior optical technologies, these new lenses cover a wide range of focal lengths, allowing photographers to shoot everything from landscapes and group photos to portraits and close-ups. When in telephoto mode, the minimum focusing distance is just under 15 inches, resulting in excellent quality close-ups. The detachable, reversible lens hood includes a three-prong bayonet type mount. And the zoom ring is a rubber rotating type for enhanced operability. There is also a focus mode switch and focusing ring for automatic and manual focusing. Lens Construction: 10 elements in 10 groups Number of Diaphragm Blades: 5 Minimum Aperture: F/38 Closest Focusing Distance: 0.38m Maximum Magnifcation (x) 0.26 Filter Diamete: 58mm Maximum Diameter x Length (mm) 66.4 x 71.2 Weight: 200gr