What is CCD?

Users questions:CCD sensors called charge-coupled device, which is a special kind of semiconductor material, from a large number of separate light-sensitive diodes, generally arranged according to matrix form @ the CCD camera, when the general location, and we do the naked eye see? Canon: PowerShotA620PowerShot520DigitalIXUS55 (SD450) DigitalIXUS700 (SD500) Panasonic: LumixDMC-FX8 which one of the most cost-effective models do? ? ? ? ?
Experts answer: naked eye can see. The role of people's eyes as theFundus, the camera inside the film. Which model is best value for money? I dare not crazy. Thank you for your question!
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