Canon Super 21 PJ21x7B IE Box Lens


USED Canon Super 21 PJ21x7B IE Box Lens

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The Canon Super 21 was a part of the next generation of broadcasting systems.  This was one of the first systems utilizing the 16:9 format and an expansion of the luminance signal transmission bandwidth is being considered.  The use of component signal is becoming more widespread and, therefore, an improvement in chromatic aberration is needed of a higher standard than that currently available today.

The  generation 3 group, pioneered by Canon, provides a higher optical performance with a wide angle of 7mm, without a significant change in length. The new lens is comparable in size to the successful J20xSuper.

By employing a 3 group the SUPER 21 diminishes the variation of lateral and longitudinal chromatic aberration while focusing.

The next generation 16:9 format will have a 20% reduction in height compared to the previous 4:3 format and thus the density of the scanning lines will be 20% greater.
Transmission bandwidth will, therefore, become 6MHz instead of the existing 4 or 5MHz.

As a result, higher MTF performance is required at these greater frequencies. In order to achieve this, the SUPER 21 was evaluated at every stage by MTF testing, given the optimum aberration balance, in addition fluorite and extraordinary dispersion glass is used in the focusing and variator groups. The SUPER 21 succeeds in having the higher MTF performance
necessary for the coming 16:9 format correspondent to 6MHz.

The use of cameras with high resolution 10 Bit iris control for camera colour matching is increasing in multi-camera studios. In response to this, the SUPER 21 incorporates a new electrical and mechanical system for the lens iris, which achieves the high resolution and repeat ability for either standard 8 Bit or the new 10 Bit iris control.

Optionally available for the SUPER 21 is the dual aspect ratio switching system,”CROSSOVER” for switchable 16:9/4:3 cameras. The 4 position extender turret incorporates a 0.8 CROSSOVER unit in addition to the normal extenders i.e. 1.0,1.5, or 2.0.  When the CCD switches to the 4:3 mode, the extender turret rotates to the 0.8 position. The 0.8 CROSSOVER unit reduces the diameter from 11 mm to 9 mm thus shortening the focal length to produce an identical picture angle. In essence, the 0.8 CROSSOVER unit acts as a 1.0 extender for the switched 4:3 aspect ratio.

Super 21 PJ21x7B SUPER 21 – PJ21X7B IE
Zoom Ratio 21x
Built-in Extender 2.0x (1.5x:option)
Range of Focal Length 7~150mm
(with Extender) 14~300mm (2.0x)
Maximum Relative Aperture 1:1.5 at 7~120mm
(with Extender) 1:1.9 at 150mm
1:3.0 at 14~240mm (2.0x)
1:3.8 at 300mm (2.0x)
Angular field of view 4:3 Aspect Ratio 64.3° x 50.5° at 7mm
(with Extender) (8.8 x 6.6mm) 3.4° x 2.5° at 150mm
34.9° x 26.5° at 14mm (2.0x)
1.7° x 1.3° at 300mm (2.0x)
16:9 Aspect Ratio 68.9° x 42.2° at 7mm
(9.59×5.39mm) 3.7° x 2.1° at 150mm
37.8° x 21.8° at 14mm (2.0x)
1.8° x 1.0° at 300mm (2.0x)
Minimum Object Distance (M.O.D.) 0.6m (0.2m with Macro) from front lens vertex
Object Dimensions at (M.O.D.) 4:3 Aspect Ratio 97.2 x 72.9cm at 7mm
(with Extender) (8.8×6.6mm) 4.5 x 3.4cm at 150mm
48.6 x 36.5cm at 14mm (2.0x)
2.3 x 1.7cm at 300mm (2.0x)
16:9 Aspect Ratio 106.6 x 60.0cm at 7mm
(9.59×5.39mm) 4.9 x 2.8cm at 150mm
53.3 x 30.0cm at 14mm (2.0x)
2.5 x 1.4cm at 300mm (2.0x)
Macro Yes
Size (W x H x L) 241 x 259 x 554mm
Weight 37.5 lbs