Functions
Convex lens | To focus the light of an object onto the film so that a sharp image can be produced. |
Diaphragm | To control the size of the aperture and hence control the amount of light move into the camera. |
Focusing Ring | To adjust the distance between the lens and the film so that the image is sharply focus on the film. |
Film |
|
Shutter | Open when picture is taken to allow light move onto the film. The shutter speed is the length of time when the shutter is open. It control the amount of light move onto the film. |
Aperture | Open when picture is taken to allow light move onto the film. The shutter speed is the length of time when the shutter is open. It control the amount of light move onto the film. |
Note:
- The film, which is normally kept in total darkness, contains a light-sensitive chemical called silver bromide.
- When you press the camera button, a shutter in front of the film opens then shuts again, exposing the film to light for a brief moment only.
- Different intensities and colours of light across the image cause varying chemical changes in the film, which can later be developed, 'fixed', and used in printing a photograph.
- The image formed on the film is
- Real
- Inverted
- Smaller than the object.