Here is a lense used to capture images suitable for HDTV broadcasting. It is made by Canon, and is the lightest HD Zoom Lens with 15X zoom ratio.
Like the widescreen movie formats, the screen on HDTV is formatted much closer to the way we see. Our field of vision is rectangular, not square. So, when we view movies in widescreen format, the image fills our entire field of vision and has a much more powerful impact. The average of the widescreen formats seen in the theater is about 16 x 9, so that's the ratio chosen for HDTV.
However, that's only part of HDTV. Besides a wider screen, the picture is going to have more detail and crisper images. We're going to see bigger pictures and finer resolution. (NTSC = National Television Systems Committee)
There are several good reasons to go digital, including: how much data it can transmit, how consistent the data stays over distance, and what type of data the signal can carry. For the same amount of bandwidth, you can stuff a lot more information into a digital signal than an analog signal. A digital signal doesn't produce the same problems with the picture we see on a distant analog television, either. And television in the digital age won't be limited to video and audio; our televisions will become truly interactive. Combined with HDTV and digital sound, this means a better picture, better sound, and digital data.
Last Updated: May 19, 1999
Created by Diana Waxman , Jessica Bureau & Greg Roeberg