Do you remember the limitations one faced using the old film faced cameras, where in one had a limit of clicking standard 32 images, which could be done only after rolling the camera reel, back to the original state after a photo was clicked. A photographer at an even had to carry dozens of camera rolls with him at an event, and the rate of capturing was also slow.
But with the advent in the technology digital cameras were created which instead of using photo sensitive chemical known as film, used charge coupled device (CCD), an electronics instrument that creates a pixel map based on the electric charge generated when photons slam into a sensitive material. This was the Photo Electric Effect, invented by Albert Einstein and was now utilized in advancing a new league of cameras.
This is how it works:
• In the digital cameras, there are a number of image sensors on the array, which are placed across the microchip of the camera. Every image sensor is a charged-couple device (CCD) converting light into electric charges. In it silicon chips are used fundamentally to measure the light. The charges that are created are stored as analog data that are then converted to digital via a device called an analog to digital converter.
• The chip also contains very small light-sensitive diodes which are in a collective. They are called photosites or pixels. They convert light into electrical charges called electrons. These pixels are light sensitive, so when brighter light strikes them, it produces a greater build up of electrical charges. Thousand such array receptors create one pixel, and every pixel corresponds to some information stored.
• The light enters the digital camera via the lens, same as it is in the conventional analog camera. When this light hits the disc the shutter opens and thereby illuminates every pixel, however with various intensities. Each pixel is combined after the computing on the microchip where the stored information is gathered and an image is created. This created image is transferred to memory cards of the Digital Cameras. The memory cards can be of varied memories ranging from 512 Mega Bytes to unprecedented limit of 16 Giga Bytes.
• A cameras resolution is rated in mega pixels, which are in turn the pixels of data gathered by the lens on the microchip. More the number of pixels more are the resolution. With the increase the mega pixel number the price of the camera also ascends vertically. But you don’t need to worry as cameras of good resolution come in economical range and are viable for good prints. The digital cameras have allowed the users to no need to go and get each roll published and then creating an album which utilizes space and get affected by natural conditions too. Now they are in digital formats and stored on your hard disk or even uploaded on internet.
The digital cameras with increased memory life and increased memory have increased the range of its usage, and made it more viable and economical for a common man to buy it and use it efficiently.