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digital camera


Digital cameras are filmless cameras. They store image in the form of pixels digitally on a light sensitive screen instead of on a film. These digital images are stored either on a built-in flash memory, hard disk or on a dvd disc

in digital camera the image is stored in bits ie digitized form in a microchip inserted in the camera
The image sensor employed by most digital cameras is a charge coupled device (CCD). Some cameras use complementary metal oxide semiconductor (CMOS) technology instead. Both CCD and CMOS image sensors convert light into electrons. If you’ve read How Solar Cells Work, you already understand one of the pieces of technology used to perform the conversion. A simplified way to think about these sensors is to think of a 2-D array of thousands or millions of tiny solar cells.

A CMOS image sensor Instead of film, a digital camera has a sensor that converts light into electrical charges.

The image sensor employed by most digital cameras is a charge coupled device (CCD). Some cameras use complementary metal oxide semiconductor (CMOS) technology instead. Both CCD and CMOS image sensors convert light into electrons. If you’ve read How Solar Cells Work, you already understand one of the pieces of technology used to perform the conversion. A simplified way to think about these sensors is to think of a 2-D array of thousands or millions of tiny solar cells.

The amount of detail that the camera can capture is called the resolution, and it is measured in pixels. The more pixels a camera has, the more detail it can capture and the larger pictures can be without becoming blurry or “grainy.”
Some typical resolutions include:

256×256 – Found on very cheap cameras, this resolution is so low that the picture quality is almost always unacceptable. This is 65,000 total pixels.
640×480 – This is the low end on most “real” cameras. This resolution is ideal for e-mailing pictures or posting pictures on a Web site.
1216×912 – This is a “megapixel” image size — 1,109,000 total pixels — good for printing pictures.
1600×1200 – With almost 2 million total pixels, this is “high resolution.” You can print a 4×5 inch print taken at this resolution with the same quality that you would get from a photo lab.
2240×1680 – Found on 4 megapixel cameras — the current standard — this allows even larger printed photos, with good quality for prints up to 16×20 inches.
4064×2704 – A top-of-the-line digital camera with 11.1 megapixels takes pictures at this resolution. At this setting, you can create 13.5×9 inch prints with no loss of picture quality.

Digital SLR Cameras

SLR stands for Single Lens Reflex. Digital SLR cameras are very similar in operation to their 35 mm SLR countereparts. Also, many camera companies (such as Cannon and Nikon) have built their digital SLR models to be compatible with 35 mm SLR lenses. This is a great benefit to professional photographers who can select a model that is compatible with their existing lenses.

Digital SLR cameras provide an amazing ammount of creative control over the camera and the resuting images. Also, these cameras provide resolutions over 6 Megapixels and can produce prints of poster size without noticable pixelazation.

A Digital SLR camera (without lenses) is a pricey investment indeed. Currently, you can expect to spend $1500 or more on the camera alone. Accessories and lenses cost extra.

Semi Professional Digital Cameras

A semi professional digital camera is a more advanced version of a point and shoot digital camera. Typicaly, these cameras provide resolutions between 5 and 6 megapixels (million pixels). They also often offer the user additional settings and greater control over the camera. The image quality of these cameras is good enough to produce clear prints up to about 8 x 10.

A semi professional digital camera may be the best option for you if you seek greater creative control than you can get with a point and shoot model. The increased flexability does come with a price. Most semi professional models are priced much higher than point and shoot models.

Point and Shoot Digital Cameras

Most consumer cameras on the market today fall into the category of Point and Shoot digital cameras. These cameras usually provide resolutions of between 2 and 4 megapixels (million pixels). These cameras are the digital version of your typical 35mm consumer camera.

Most consumer cameras on the market today fall into the category of Point and Shoot digital cameras. These cameras usually provide resolutions of between 2 and 4 megapixels (million pixels). These cameras are the digital version of your typical 35mm consumer camera.

Digital Cameras can be divided into two broad Categories, “Compact Digital Cameras” and Digital SLR Cameras”. The choice of using a digital compact camera or a digital SLR camera can depend on many factors as the users of digital cameras fill a spectrum covering the occasional user, the amateur photographer, the serious amateur right to the semi professional and the professional photographer. Fortunately the makers of digital cameras are very well aware of the many different types of camera users out there, and produce digital models to suit every taste.
A semi professional digital camera is a more advanced version of a point and shoot digital camera. Typicaly, these cameras provide resolutions between 5 and 6 megapixels (million pixels). They also often offer the user additional settings and greater control over the camera. The image quality of these cameras is good enough to produce clear prints up to about 8 x 10.

A semi professional digital camera may be the best option for you if you seek greater creative control than you can get with a point and shoot model. The increased flexability does come with a price. Most semi professional models are priced much higher than point and shoot models.





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