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Extra info for Videomaker Guide to Video Production, Fourth Edition
It is this fact that makes digital so remarkable. No matter how many times you copy it, there is no generation loss like there is with analog video. “On the way out, the video image is again stored in the buffer. Now, you can run it into a computer with a FireWire connection and edit it if you want. But if you just want to display it on a TV, you need to convert the digital image back to analog, the only thing a typical TV can handle (see Figure 4-5). ” I proposed. “Right again, genius. That same circuit can also send a signal to the LCD viewfinder on your camcorder.
Typically, a camcorder has 300,000 to 500,000 pixels, but some new ones have a megapixel (1 million pixels). ” “Save your money, bud,” Dooley growled. “Most megapixel CCDs are just for still images and HD cams ain’t cheap. Now pay attention. These CCDs are scanned just like a TV, pixel by pixel, row after row. The Dissecting a Digital Camcorder Figure 4-3 The Retina—The CCD records the light that is focused by the lens in discrete pixels. output creates a varying voltage that travels through an analog-to-digital converter.
What does that mean? What’s wide-angle, normal and telephoto in that range? 27 8 mm would be wide-angle, about 15 mm would be normal and 80 mm would be telephoto. But regardless of what’s normal for a given lens, the smaller the number (8 mm in this case), the wider the angle. The larger the number (here 80 mm), the tighter the angle. Today many compact cameras use 1/3-inch CCDs, so their zoom lenses feature shorter focal ranges. In this format, a normal focal length is around 10 mm, a wideangle setting would be 5 mm, and a strong telephoto would be 50 mm.