Lens Construction (group) 16 Lens Construction (element) 22 No. of Diaphragm Blades 8 Minimum Aperture 22-38 (1/3-stop increments is F22-40) Closest Focusing Distance 0.7m Diagonal Angle Of View 75 degrees - 8 degrees 15" Filter Diameter 77mm Maximum Diameter x Length 92mm x 184mm Weight 3.7lb/1,670g The Zoom Lens EF28-300mm f/3.5-5.6L IS USM replaces the EF35-350mm f/3.5-5.6L USM released in 1993. The new lens offers an extended zoom range at the wide-angle end and incorporates an Image Stabilizer (IS), which compensates for approximately three shutter speeds, allowing the handheld capture of shots that would otherwise be blurred by camera shake. The EF28-300mm f/3.5-5.6L IS USM delivers high-contrast, high-resolution images for which Canon"s L-series is renowned. A combination of advanced optical technologies, including UD (ultra-low dispersion) and aspherical lenses, work in concert to achieve a high zoom ratio of approximately 11x while effectively correcting for a variety of aberrations that can occur when zooming. Featuring a new optical design, the lens makes possible a minimum focusing distance of just 0.7 meters throughout the entire zoom range. Other features include a circular diaphragm for improved background blur, and a hardy waterand dust-resistant construction, ensuring professional users unfailing performance under even the most grueling of conditions. And, in consideration of the environment, the model uses only lead-free glass elements.