CN-E15.5-47MM T2.8L S/L SP – OPTICAL PERFORMANCE
- EF mount (S model) and PL mount (SP model).
- Focal length of 15.5-47mm.
- 11-blade aperture diaphragm.
- Minimised Focus breathing.
- Precision back focus adjustments with lens markings on both sides.
- Uniform Gear Positions, Rotation Angles and Front Lens Diameters.
WIDESPREAD LENS MOUNT COMPATIBILITY
The CN-E15.5-47mm T2.8L S/L SP is available in both EF and PL mounts, providing complete compatibility options for filmmakers who either wish to embrace Canon’s long-established, and wide-ranging, EF lens mount system or to take advantage of the wide angle of view in the industry-standard PL mount.
OUTSTANDING OPTICAL PERFORMANCE
The CN-E15.5-47mm T2.8 L S/L SP is a lightweight EF/PL mount lens for Super 35mm format with exception optical performance for demanding high-end productions. This lens will surpass the performance requirements of any 4K imaging system. It features advanced optical design with fluorite and large aspherical lens elements to achieve sharp, consistent images throughout its zoom range, and has a unique optical design that has significantly minimized focus breathing facilitating a new level of creativity in focus pulls. It also has a remarkably broad rotation angle of Focus 300°/Zoom 160° which realises high accuracy in operating the lens.
CN-E15.5-47MM T2.8L S/L SP – EASE OF USE
VERSATILITY AND EASE OF USE
The CN-E15.5-47mm T2.8L S/L SP lens has markings on angled surfaces on both sides of the barrel, making it easy to read settings from behind, or from either side of the camera. Focus markings can even be switched from standard labeling to metric, depending on production need. This lens is equipped with control rings maintain the proper amount of resistance with consistent operating torque, and a covered flange-back adjustment mechanism to meet numerous production application needs.
This lens also incorporates geared inner focusing to minimize focus-induced changes in the angle of view, while an 11-blade aperture diaphragm ensures beautiful bokeh. Innovative glass construction counteracts barrel expansion and contraction to avoid temperature-induced marking discrepancies.
Furthermore, computer simulation based on the ISO Color Contribution Index (CCI) is employed to achieve a tight colour reproduction match between all the Canon PL mount lenses.
PRECISE FOCUSING CONTROL
With a focus rotation angle of approximately 300 degrees and a zoom rotation angle of approximately 160 degrees the lenses facilitate precise focusing performance whilst allowing for smooth and subtle zoom operation.
INDUSTRY STANDARD COMPATIBILITY
These top-end cinema zoom lenses can be used with standard manual and electronic movie industry accessories, as well as matte boxes. Featuring a unified front lens diameter and uniform gear positions, the lenses do away with the need to adjust or reposition accessory gear when switching between other lenses in the series.
ANOMALOUS DISPERSION GLASS
To eliminate chromatic aberration the CN-E15.5-47mm T2.8L 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 colours, 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. Although it is not quite as good as fluorite, its performance is significantly better than ordinary optical glass. So by using AD glass Canon has been able to manufacture lenses with superior performance and at a lower cost than before.
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.
LARGE ASPHERICAL LENSES
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.