Technology Used in Broadcasting Equipment
In addition to HDTV (High-Definition Television) broadcast lenses and network cameras etc., Canon has developed a next-generation Super Hi-Vision (SHV) television broadcast lens which effectively meets the demands of professional users.
Auto Focus HDTV 100x Zoom Lens
World's Highest Class TV Broadcast Zoom Lenses with Auto Focus Technology
Canon television broadcast camera lenses are renowned for their outstanding optical performance and exceptional reliability. The flagship model of the lineup is the world's first HDTV-compatible 100x zoom lens.
This lens incorporates optical element manufacturing technologies such as ultra-low-dispersion (UD) new glass material and fluorite, as well as optical design technology, which takes maximum advantage of the characteristics of these elements. Together, these technologies ensure ample compensation for phenomena like chromatic aberration and curvature of field while maintaining a practicable and manageable lens size.
Standard built-in features include an Optical Shift Image Stabilizer that allows users to change anti-vibration properties according to shooting conditions, and a digital servo system that makes possible high-precision lens operation.
Canon's latest broadcast zoom lens, the DIGISUPER 100AF, incorporates a proprietary auto focus system. By employing a registration phase-detection sensor system, the new model delivers high focusing accuracy that is suitable for full high-definition video images, high tracking capability to keep high-speed moving objects in focus, and the ability to achieve focus rapidly from a completely defocused state. The DIGISUPER 100AF offers practical full-time auto-focus (AF) that fulfills the demands of professional HDTV camera operators.
Examples of DIGISUPER 100AF in Use
SHV Zoom Lens
A Super High Performance Lens with Four Times the Performance Capacity of a Full High-Definition Television Lens
Canon's broadcast lenses have a 50-year history and enjoy solid support thanks to their outstanding optical performance and exceptional reliability. In particular, Canon's zoom lenses are highly praised for the dynamic images that they produce, and are being used in the development of the SHV image capture system that Japan Broadcasting Corporation (NHK) plans to roll out in 2025.
SHV is an ultra high-definition image format of 4,320 vertical scanning lines that contain 16 times the data volume of the full high-definition TV format. The lenses used are required to be capable of a resolution of at least 240 black and white line pairs within a width of 1mm. At such a high spatial frequency, the wave characteristics of light mean that, the narrower the aperture of the lens, the greater the effects of diffraction, whereby lens performance deteriorates. This means that lenses need to be able to correct to the utmost degree any aberration between a bright f/ number and full aperture (a factor in the deterioration of lens performance).
Under these challenging conditions, as a first step toward the realization of this new broadcasting format, utilizing its own optical theory and design technology, adopting new optical materials and improving upon its manufacturing technology, Canon has worked in cooperation with Japan Broadcasting Corporation and succeeded in developing a zoom lens that boasts the SHV system's first tenfold zoom ratio. This zoom lens has virtually zero chromatic aberration or field curvature (loss of resolution at the peripheral edges of an image) at zoom positions from wide to tele, enabling natural and high quality rendering.
Additionally, from a practical application perspective, the lens has been made compact and light, and is powered by a newly developed motor unit, guaranteeing the same high level of operability as conventional high-definition cameras.
SHV Resolution Comparison
SHV 10x Zoom Lens