1. Basic Camera Function
The camera converts an optical image into electrical signals that are reconverted by a television receiver into visible screen images.

2. To do this, the camera needs:
Lens
Camera body
Viewfinder

3. Camera
Camera contains a beam splitter (imaging device) which converts optical image from lens into electrical signals.

4. Lens
Gathers and transmits light.

5. Camera Body
Converts light into an electrical signals.

6. Viewfinder
Reconverts electrical signals into video pictures of the lens generated scene.