| Digital
Cameras Knowledge |
1.How do digital cameras work?
In contrast to a conventional film camera, in a digital camera the light is focused onto an image sensor called a CCD (charge coupled device). The CCD is a collection of light-sensitive photosites that produce an electric charge when struck by light. These charges are converted into numbers that are stored in the memory (usually on a memory chip). From there, the whole image can be displayed, sent to a computer, or even printed directly on a printer.
2.What are SLR digital cameras?
In an SLR (Single Lens Reflex) camera, the user is seeing exactly what the camera is seeing through a series of prisms and mirrors. This becomes important for more advanced photographers. In SLR cameras, it is also possible to interchange lenses and keep the lenses from other cameras. Many digital SLR cameras also offer higher resolution since they are aimed at the pros. The disadvantages of SLR digital cameras are the significantly higher costs, bigger size and weight, and a small delay before the photo is taken because the mirror has to move out of the way before a shot.
3.Will an airport X-Ray scanner erase my
pictures on a digital camera card?
No, the chance of this happening is very remote.
4.What about MPEG movie modes
in digital cameras?
Many digital cameras offer the ability to shoot short movies that are saved in the MPEG formats. Unfortunately, the quality of these movies doesn't come close to the movies shot with a camcorder. They are often severely limited in terms of length. Some cameras also don't record sound.
5.What is the difference
between a PAL and NTSC camcorder?
In North America, the video system used is called NTSC. Overseas, the video system s typically PAL. These systems are incompatible with each other.
6.What is Secure Digital?
The Secure Digital (SD) Memory Card is a flash memory storage device designed by the consortium of Matsushita Electric (Panasonic), SanDisk and Toshiba to meet the security, capacity, performance and environmental requirements inherent in emerging audio and video consumer electronics devices. The SD Card design is highly leveraged from the existing MultiMediaCard specification. Key enhancements over the MultiMediaCard include cryptographic security for protection of copyrighted data, a 4X improvement in maximum data transfer rate and a user-selectable write protect switch on the card casing. Improvements in Electro Static Discharge (ESD) tolerance are also provided through enhancements to the card's protective casing.
SD Memory Cards are non-volatile, which means they do not require power to retain the information stored on them. They are solid-state devices, so they have no moving parts to skip or break down. They will offer an incredible combination of high storage capacity (32 MB & 64 MB in 2000, with the promise of up to 128 MB and 256 MB in the not-too-distant future), fast data transfer, great flexibility and excellent security. And of course, incredibly small size.
SD will facilitate fast, simple, secure downloading of all types of digital files, like music, movies, photos, news ¡X even cooking instructions for your microwave. Once downloaded to your PC, you can organize and store the files as you wish. Then easily transfer the files from your PC to a super-compact SD Memory Card, which will be accepted by a whole variety of future SD-enabled products. Of course, you will also be able to directly record your own audio, video, still photos, and more onto SD Memory Cards, as such products become available.
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