A breakthrough lens for Canon, that leverages years of Canon experience with broadcast TV and ENG-camera optics. Now, Canon enters the motion picture market, with zooms designed for Super 35-size film and digital cameras and, optically ready for 4K resolution. The "S" designation indicates this is a Cinema EF lens, with Canon's EF lens mount. With wide to "portrait length" tele coverage, it's the ideal standard zoom for TV, cinema, documentary shooting, and more. Focus operation is super-smooth, gear positions are identical to the 30-300mm telephoto zoom, and the optical design is uncompromised for high-end cine use.
To reduce chromatic aberration the CN-E14.5-60mm T2.6L S/ L SP zoom lenses employ anomalous dispersion (AD) glass. When light passes through a lens, it refracts (bends). It also breaks up into its constituent colors, just like light passing through a prism. The lower the refractive index of the lens material, the less it bends and the sharper it can be focused. Similarly, the lower the dispersion ratio, the less the light is broken up, which makes it easier to correct chromatic aberration. AD glass is similar to fluorite in that it features a low refractive index and low dispersion. Using AD glass Canon has been able to manufacture lenses with superior performance at a lower cost.
Using the latest advances from new ghosting simulation (optical simulation), that's been refined through Canon's broadcast HD zoom lens development, an anti-reflective lens coating offers reduced ghosting and flare.
Within the optical construction of the zoom lenses large aspherical lenses are deployed to reduce distortion and deliver unrivalled optical performance. In the early days, all lenses were spherical they are the easiest lens shape to make, but are not best suited to rendering a sharp image as they cannot make parallel rays of light converge at the same point. This causes a problem called spherical aberration. Canon designers discovered that an aspherical (non-spherical) lens shape would eliminate these spherical aberrations, because the curvature of the lens could be used to converge the light rays to a single point.
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