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Digital Cameras Sale Megapixel Color Weight
   
Choosing a digital camera
Four factors decide a digital camera's worth.
Digital cameras use CCD's as the sensing element, it takes the place of film. The resolution is the number of pixels in the captured image. The more pixels, the more detailed the image can be. .
The aperture of a lens is its maximum opening. The bigger the aperture, the more light is gathered, and the less light you need to take a good photo. This is the most overlooked lens specification, but it very important, especially if you like to take photos indoors without flash or from a reasonable distance.
Lens aperture is measured in f/numbers, such as f/2.0 or f/3.5. An aperture of f/2.0 literally means that the lens opening is half the focal length of the lens. Thus, smaller numbers mean bigger lens openings. You would rather have a lens that is f/2.0 than a lens that is f/4.0.
A zoom lens has a variable focal length. The focal length determines the magnification of the lens. A short focal length is a wide-angle lens, great for taking in large vistas. A long focal length is a telephoto lens, allowing you to get a tight photo of a distant object or person. A zoom lens lets you combine both of these and everything in between into a single adjustable lens. If a camera has a 3X zoom, it means that the longest focal length is 3 times the shortest.
Ignore digital zoom specifications, what is important is optical zoom. Digital zoom is of no value. All it does is crop the image in the camera.
Do not buy a superzoom without image stabilization unless you plan on using a tripod.
Lenses with the same focal length and aperture can differ substantially in quality. A poor lens is not as sharp, and it may exhibit chromatic aberration, which means that all colors are not brought to the same focus. This usually shows up as colored fringes at high contrast edges.
Unlike aperture and zoom range, you cannot read the lens quality of the camera box. The two best approaches to getting a good lens are read reviews, and stick with reputable camera companies.
When you snap a digital photo, the camera first grabs a "pre-photo" to determine the brightness and color balance of the scene. It then shoots the real picture, based on the earlier information.
Most digital cameras use CompactFlash or Secure Digital. The difference is not worth worrying about unless you already have a good supply of one type.
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