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4KTV screens without providing for the appropriate needs for the cameras. There are plenty of 4K cameras with 35mm-like sized sensors, but very few with half-inch sensors. Sony has recently introduced a new 4K-for- TV camera onto the market. The PXW-Z100, which features a 1/2.33- inch Exmor CMOS sensor, shoots 4K at 50p or 60p. The company describes this as its ‘latest step in expanding the 4K world to everyone, from high-end cinema to corporate and event productions’. The camera is said to include a fixed 4K-compatible high-performance G Lens, weighs less than 3kg and uses the XAVC recording format. Based on the same shooting ergonomics as a conventional handheld professional camcorder, 4K content can be recorded without extra equipment. Although 4KTV is still not widely distributed its camera footage certainly has its uses in post production. It can be down-converted to produce high quality 1080p or to provide a high quality HD zoom-in. This camera is a welcome step but, of course, a whole new range of broadcast 4KTV cameras based around half-inch (or there about) sensors is needed. And there is more. Focusing all the image detail needed to provide full 4K definition onto the small sensor is also a challenge. While modern fabrication technology is well able to deliver the required number of photo sites in a small area of a CMOS silicon chip, the extreme accuracy required from the camera optics, the lens and its assembly, may be the factor that has held back the arrival of the professional half-inch 4K camera. TV-BAY MAGAZINE: ISSUE 82 OCTOBER 2013 | 49