Definition of "aspherical" []

• Not (quite) spherical (adjective)

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• "Special optical technologies, such as aspherical optics and fluorite elements are featured in the widely acclaimed L-Series lenses, and Canon Image Stabilizer technology in select lenses helps to minimize the effect of camera shake."
• "Digital MiniDV Handycam camcorder with a 58mm aspherical lens and 380,000-pixel CCD; 12x optical zoom lens (digital zoom to 48x) with Super SteadyShot image stabilizer; manual controls for shutter and exposure, Stamina Power Management, and intelligent accessory shoe."
• "Lens 6.3 – 63 mm (38 – 380 mm on a 35 mm camera), 10x optical zoom lens, Open f/1.8 (W) – 2.5 (T), galvanometer method structure, AF: 8 groups, 11 lenses (3 aspherical elements, 5 aspherical surfaces), built-in ND filter"