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Canon KH21ex5.7BIRSE 1/2" HD Professional Lens |
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5.7-120mm, double hot shoe, digital drive unit, servo zoom, manual focus, 2X ext' macro. (For Sony)
In 2006 Canon is introducing a new family of portable HDTV lenses for EFP, ENG, and a range of corporate and business industrial applications. In so doing, an important hierarchy in HD optics is being created. It is important because of the highly innovative developments by the world’s major professional video manufacturers in their recent introduction of a diverse range of new low-cost tapeless HD camcorders and tape-based HDV professional camcorders. Various design strategies have been adopted by the manufacturers to decisively drive down the costs of these HD acquisition systems. They include different image format sizes, subsampled imagers, and contemporary digital recording techniques. In support of these products Canon is designing an entire new family of cost-effective HD lenses that seek to match both the performance and the costs of these diverse and still-emerging HD acquisition systems. To distinguish this level of lens within the overall Canon HD optical hierarchy they are being identified by the logo HDgc – to clearly differentiate them from the already established high performance HDxs line of 2/3-inch portable lenses.
These new acquisition systems have been developed in response to the broadcast industry’s rapidly growing interest in transitioning to HDTV Newsgathering, HD reality shows, and other lower-budget HD productions. They also directly address the increasing adoption of HD digital origination by the growing independent filmmaking market sector. In addition, they are anticipated to foster growing interest in HD within the broad B2B market sectors. To support this extensive flexibility in HD acquisition systems, the new HDgc family will include 2/3-inch, 1/2-inch, and 1/3-inch lenses.
The KH21ex5.7 is a telephoto portable HDTV production lens within the 1/2-inch image format sector of the HDgc family. This particular lens is intended for producers and broadcast and cable news photographers having as their foremost priority the ability to shoot over long distances combined with reasonably wide angle capture in a lightweight (4.1 lbs) mobile production lens system having very good HDTV performance. It was specifically designed for the new HD XDCAM camcorders of Sony, which utilize three 1/2-inch 1440-element CCD imagers. It is an important member of the emerging HDgc family in terms of facilitating HD imaging with equivalent operational capabilities as the established 2/3-inch SDTV systems. |
KH21ex5.7BIRSE
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Details
Specifications
| IMAGE COMPOSITION KH21ex5.7 IRSE |
| Object Image Format |
1/2 Inch 16:9 Aspect Ratio |
Object Image Size (Presented to
Camera Imagers) |
6.97 mm (H) x 3.92 mm (V) |
| Zoom Ratio |
21 X |
| Focal Length Range |
5.7------------120mm |
| with Extender |
11.4------------240mm |
| Angular Field of View : |
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| At 5.7mm |
62.9° (H) x 38.0° (V) |
| At 120mm |
3.3° (H) x 1.9° (V) |
| With Extender : |
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| At 11.4mm |
31.5° (H) x 19.0° (V) |
| At 240mm |
1.7° (H) x 0.9° (V) |
| SCENE COMPOSITION KH21ex5.7 IRSE |
| Minimum Object Distance (MOD) (From Front of Lens) |
0.8 Meter (10mm with Macro) |
| Scene Object Dimensions at MOD |
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| At 5.7mm |
92.2 cm x 51.9 cm |
| At 120mm |
4.3 cm x 2.4 cm |
| With Extender |
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| At 11.4mm |
46.1 cm x 26.0 cm |
| At 240mm |
2.2 cm x 1.2 cm |
| OPTICAL BRIGHTNESS KH21ex5.7 IRSE |
| Maximum Relative Aperture |
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| (F-Number) |
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| At 5.7mm-------86mm |
1 : 1.4 |
| At 120mm (Ramping Characteristic) |
1 : 1.95 |
| with Extender |
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| At 11.4mm------172mm |
1 : 2.8 |
| At 240mm (Ramping Characteristic) |
1 : 3.9 |
| PHYSICAL ATTRIBUTES KH21ex5.7 IRSE |
| Size |
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| Width |
169.4mm |
6.7in |
| Height |
111.9mm |
4.4in |
| Length |
217.5mm |
8.6in |
| Weight |
4.08lbs |
1.85kg |
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