Camera structure

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Analysis:

The optical glass of the lens concentrates the light beam from the front and focuses it on the film to form a clear and recognizable image. A simple lens is made of a piece of curved glass or plastic. More complex lenses are composed of two or more pieces of optical glass called lens units, and all the lens units are assembled together into a whole.

3. Film In a traditional camera, film is a photosensitive material, and after a certain chemical treatment, the captured image will be recorded. In the camera, the "film" will record the image instantly in a magnetic way.

4. The viewfinder viewfinder can roughly display the image to be recorded on the film, which will guide the photographer to aim and compose. The viewfinder of some cameras is a simple observation window, while the viewfinder of a single-lens reflex camera is composed of a reflector and a prism, so the photographer can directly watch the image through the lens. For a camera, the viewfinder is usually a miniature TV screen.

5. Focus control device For serious works, people definitely want the camera to focus the light and record as clear an image as possible on the film. Some cameras can achieve this goal by rotating the lens barrel or adjusting the focus button, while for autofocus cameras, this work is done by controlling the micro-motor by the computer chip to move the lens.

6. Shutter This is a mechanical or electronic device that controls the length of light entering the camera. Some cameras can set the shutter speed by turning the knob or pressing the button; The shutter speed of other cameras is set automatically.

7. Shutter This is the button used to operate the shutter.

8. Aperture This device controls the amount of light reaching the film according to the change of the aperture size of the lens. Iris-type aperture consists of a series of overlapping thin metal blades, and the size of the central circular hole can be changed by the clutch of the blades. A large or small aperture can increase or decrease the amount of light reaching the film through the lens.

Some cameras can change the aperture of the diaphragm by rotating the ring on the lens barrel, while others automatically change the aperture of the diaphragm by controlling the micro-motor through the microprocessor chip.

9. Film Transfer This is a mechanical device for moving the film in the camera, which can expose the films on the film axis one by one in sequence. Some cameras can transfer the film by pulling the reel lever, while others can transfer the film automatically.

The camera uses a single loose-leaf sheet to take each photo. In later courses, a special class will be arranged to introduce this camera.