Difference between analogue and digital cameraBy admin • Oct 10th, 2008 • Category: Uncategorized
Cameras from appearance don’t let one knows what is the difference between the functioning and working of the analogue or digital camera. Both of the types of the cameras, digital and film have great many differences among them.
Cameras from both categories have to perform same functions especially in letting in the sufficient light and focusing the gathered light. All of this gathering and focusing need special co-ordination among the functional parts, mentioned below are the difference both sort of camera exhibit.
The function of the shutter is to keep light from entering the camera and it replaces for just a thousandth of a second. It is maintained in such a way in the Analogue camera that it doesn’t take too long to over expose or too short to under expose the object. While some of the digital cameras don’t use shutters. While combining the digital and mechanical technology tends to come up with higher quality photos.
The aperture of an analogue camera helps the entrances of controlled light for the photo which is not over exposed. Digital cameras have mechanical openings to adjust the light.
Lens operates for focusing the object through the refraction process. In analogue cameras the lens actually moves for the adjustment. Digital cameras can override the fixed focus for special shots.
• Film Speed
Film’s speed describes the sensitivity to light, the more the film sensitive the faster is the reaction as it comes in contact with light in analogue camera. Digital cameras use image sensor other then film.
All of these functions are fully automatic in the digital as well as analogue cameras.
• Recording light
Black and white film is coated with what is called an emulsion layer, which when exposed results in the chemical change of halide crystal. Which after passing through the developing and printing process transforms into, photograph. This way of capturing photos on a film is adopted by analogue cameras. In digital cameras the image sensor are made up of photo sites which turn the light entering in to the camera as digital information. This information is then processed by combining hues and intensities giving rise to specific color to each pixel.
• Creation of Image in the cameras
In the process of the film development from the Analogue cameras, is bathed in chemicals which convert it into pure silver. The past which had the least exposure to the light are transparent while those which are exposed to much light are dark and dense. This is the same for both black and white and colored films. The only exception with the colored film is the inclusion of dye couplers in the process of development. The film, from the analogue cameras, are “fixed” to prevent further chemical or energy reaction creating a negative. To print the photograph, very radiant light is passed through the negative on the photographic paper, which is covered with an emulsion layer which is similar in composition with the chemical on the photographic film. The negative image after this process becomes a photograph.
While in digital cameras the light is recorded electrically. Microchip inside the camera converts the digital reading from each sensor and combines it with the stored info. Camera assigns a particular pixel.