Evolution of TV Camera Technology: From Parfocal Zoom Lenses to SECAM Capability


In a recent development in the field of television camera technology, the design of black and white cameras has undergone significant modifications. The latest design utilizes parfocal zoom lenses, specifically those designed for 35mm movie cameras, instead of the traditional ring of constant focal length lenses. The new design has proved to be highly effective in producing high-quality images, particularly with image portions. However, challenges were encountered when using a colour splitter for the three vidicon cameras.

These challenges were further compounded when Polish TV began the transition to colour broadcast, forcing them to wait for the technology to stabilize. To resolve the issue, they decided to license Bosch Fernseh cameras equipped with big Schneider lenses, and locally manufacture the cameras and VTRs while adding SECAM capability. Interestingly, almost all Eastern Bloc countries opted for the French SECAM standard due to its lower bandwidth requirements and ability to preserve colours even with phase changes on receive. In contrast, the British had experimented with the American NTSC standard a decade earlier but ultimately found PAL to be the best solution.

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