Traditionnal camera (argentical)

• The objective forms the image.
• The diaphragm the variable opening of which controle the stream of lumiére (which passes on the image reconstituted on the objective).
• The film "storing" this image by a chemical reaction of the emulsion.
• The film is then handled and processed by a specialized laboratory.
• One speaks then about analogical functioning.

    Digital camera

• The objective is always there, the diaphragm also.
• But the film is replaced by a sensor (of the size of a nail) who catches and transforms the light and the image in a continuation of digital data
  (0 and 1) thanks to a software being inside the device, until the final image which joins on a card memory which it replaces the film.
• The contents of the card report is then transferred in the computer, either by means of a cable connecting both, or through a reader connected with the computer.