In my experience as a photographer I came across countless of cameras, both digital and analog. This record is meant to illustrate the differences between the two technologies and serve as a camera buying guide for the undecided shopper.
Digital and old 35mm film cameras look and are operated almost the same: you look through the viewfinder, frame your shot and push the shutter button. However, the great distinction between them lies in the way they capture and process the image. While the 35mm predecessors used the film to capture the image, their digital successors use a charge-couple device (Ccd) known as the image sensor. This silicon chip, not larger than a letter key on the keyboard you have in front of your now, contains some grids of photosensitive diodes called pixels and each one of these will store exactly the data contained in one pixel from the photo that will be rendered so nicely on your desktop.
Digital Camera
So, when the shutter opens to take the shot, each pixel will memorize the intensity of the light that fell on it. Milliseconds later, after the shutter closes, this value is converted to a digital number, and the sequence of the some millions of numbers representing the pixels in the photo is compressed, then stored in the memory of the camera (be that internal or the memory card). When switching the camera in playback mode, this sequence is decompressed, and every particular digital value is translated into a pixel on the Lcd screen. So, in fractions of a second a lot of calculations are made, and this happens with every photo we take or replay.
There are two detach devices / media complex in the process: the image sensor, that captures and digitizes the image, and the storehouse device, similar in functionalities with the hard disk drive on your computer. With traditional 35mm cameras, the film is used both to record and store the image.
The technology behind digital cameras allows users to view the images on the built-in Lcd screen (or Tv set, if the camera has such an extension). Also, once captured, digital photos are already in a format we are all well-known with: you can insert them in Word documents, send them to your friends over your popular instant messaging client, upload on Facebook, burn on Dvd’s or plainly store them on your hard drive for later usage. This is not the case with the old 35mm-ers, where you had to drive downtown to have the pictures developed, then use a scanner to get a digital version.
To wrap it up, if you are to pick between buying a digital camera and an old film one, there are lots of reasons why you should go for the most recent technology.
Camera Buying Tips – Digital Versus Analog
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