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KJ20x8.2B IRSD

HDTV Portable HDgc Lenses

Item Code: 1518B009AA

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  • Widest Angle
    8.2mm Angle of View is widest angle of any lens in its class.

  • Built-in 2x Extender
    Previously, only relatively high-end HDTV lenses featured built-in extender. However, the recent arrival of many new lower-cost HD camcorders has created a strong market demand for more affordable HD lenses with built-in extender. This is especially important for journalism and production applications seeking cost-effective HD acquisition systems within limited budgets.

  • Outstanding Optical Performance
    New design tools, encompassing cutting-edge optical simulation and powerful 3D design technologies, combined with new optical glass materials and new optical coatings produced a novel optimization of the cost-performance ratio of this new lens. The KJ20x8.2B IRSD exhibits a high MTF at picture center that is also well-controlled out to picture extremities. The design optimization maintains that high MTF with operational adjustments of focal length and object distance. Longitudinal and lateral chromatic aberrations have been minimized as well as monochromatic aberrations like coma and astigmatism. Geometric distortion at wide angle settings is imperceptible.

    The new optical materials and multilayer optical coatings have effectively attenuated optical artifacts such as ghosting, flare, and veiling glare, that might be stimulated by strong light sources in the scene (for example, sun in daytime and car headlights at nighttime).

  • Newly Developed Advanced Drive Unit
    Various companies have rolled out cameras with lens aberration correction functions in recent years. For this reason, the KJ20x8.2B IRSD is fitted with a camera-communication interface to support these separate aberration correction functions.*1

    The KJ20x8.2B IRSD's zoom can travel end to end in 1.0 seconds, an improvement over the KJ20x8.5B KRS's speed. The servomotor has a noise-suppressing construction to ensure there is no corresponding increase in noise. The drive unit features the same ergonomically designed shape of the KJ20x8.5B KRS and others in the family that users have loved for its handling and grip.

    On the newly developed advanced drive unit, the Memo switch, which sets specific zoom positions for the Shuttle Shot function, has been changed to a push switch. On previous drive units, to memorize the zoom position, the operator had to adjust its position by a volume switch. The memo switch enables more reliable Shuttle Shot setup in the field where more consistent functioning of the controls is required.

    *1. Check with the camera manufacturer to see whether the KJ20x8.2B IRSD is compatible with the camera's aberration correction functions.

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Product Category

ENG Lens

Product Series

KJ20x8.2B IRSD

Image Composition

Object Image Format


Aspect Ratio


Object Image size

9.59 mm (H) x 5.39 mm (V)

Zoom Ratio

20 X

Focal Length Range


Focal Length Range with Extender


Angular Field of View

60.7o×36.5o at 8.2mm
3.4o×1.9o at 164mm

Angular Field of View with Extender

32.6o×18.7o at 16.4mm
1.7o×0.9o at 328mm

Optical Brightness

Maximum Relative Aperture (F-Number)

1:1.9 at 8.2-115.4mm
1:2.7 at 164mm (Ramping Characteristic)

Maximum Relative Aperture (F-Number) with Extender

1:3.8 at 16.4-230.8mm
1:5.4 at 328mm (Ramping Characteristic)

Scene Composition

MOD From Front of Lens

0.9m (10mm with Macro)

Scene Object Dimensions at MOD

98.2×55.2cm at 8.2mm
5.0×2.8cm at 164mm

Scene Object Dimensions at MOD with Extender

49.1×27.6cm at 16.4mm
2.5×1.4cm at 328mm

Physical Attributes








3.13lbs (1.42kg)


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† Prices and specifications subject to change without notice. Actual prices are determined by individual dealers and may vary.

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