This flexible zoom gives you the freedom to compose in the super-wide angle range. The circular aperture smoothes out-of-focus areas of your chosen scene. And with aspherical lenses and Analomous-dispersion (AD) glass you can be assured of sharp, distortion-free images throughout the field - even at maximum wide angle at full-open aperture. FEATURES: * Lens construction: 15 elements in 12 groups * Angle of view: 104-63 degrees * Minimum focusing distance: 1 foot * Minimum F/stop: F/22 * Filter size: 77mm * Weight: 19.2 oz.