HDTV lens

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HDTV stands for high-definition television. HDTV is available in many, but not all areas.*Certain services are available separately or as a part of other levels of service, it has reached the masses.

HDTV Information:

MPEG-2 is most commonly used as the compression codec for digital HDTV broadcasts. Although MPEG-2 supports up to 4:2:2 YCC chroma subsampling and 10-bit quantization, HD broadcasts use 4:2:0 and 8-bit quantization to save bandwidth. Some broadcasters also plan to use MPEG-4.

Some German broadcasters already use MPEG-4 together with DVB-S2 (ProSieben, Sat1 and Three Premiere Channels). Recommended receiver is Humax PR-HD 1000, but others are announced as well as PCI cards. It seems likely that all European HDTV may be MPEG-4 and Ireland, which has not yet started ANY Digital Television, is considering MPEG4 for SD Digital as well as HDTV on Terrestrial broadcasts.

The fact that a product bears the label "HD ready" does not necessarily mean that it can display the full picture resolution possible from a HD source. Most HD-ready sets do not have enough pixels (1920x1080 or 1280x720) to give true pixel-for-pixel representation without interpolation of higher HD resolutions.

Theoretically, even pixel-for-pixel is not enough, as sampling theory shows that proper image reconstruction requires more pixels in the display than were used for the original picture. This is why SDTV video sources (especially DVD) look much better on a HDTV than on the best SDTV (this is a consequence of basic sampling theory, and not a matter of image enhancement).

The term HD compatible is also being used in the UK to indicate that a display device has HDMI capability but with lower than HD-ready resolution.

Pairing of HDTV lens to an SDTV camera will enhance Maintaining performance of that imaging the that high MTF over the focal range an the HDTV lens. -

Zoom HJ40x14B Portable HDTV Lens with 40 x Canon with Built-In Stabilization. Extender and Image 2x Mfr# HJ40X14BIASDVTELE B&H# CAHJ40X14B -

in optical challenges Further HDTV studio focal design The relative light distribution behavior for a typical HDTV studio lens at one specific lens -