Convex lens (positive)
This lens is located on the front of the camera. Positive lenses serve to regulate the incoming light that is well received by the film. This arrangement is done by moving a positive lens arrangement away from or approaching the film. The function of this lens is the same as the function of the eye lens which illuminates the incoming light so that a real, inverted, and reduced image is formed.
The diaphragm is a camera part in the form of a gap that functions to regulate the amount of light entering the camera. By changing the size of the diaphragm gap, the amount of incoming light can be adjusted. To produce a good image, the diaphragm gap must be arranged in such a way.
If the light is too bright the gap of the diaphragm is made small, on the other hand if in a dim room, the diaphragm gap is opened wide. On a good camera, the size of the gap is expressed by diaphragm numbers. The greater the diaphragm number, the smaller the gap produced. Conversely, the smaller the diaphragm, the more open the gap.
Thus, seeing the function, the diaphragm on the camera has the same function as the pupil in the human eye.
Light or objects received by the lens will be forwarded to the film and form a real image, reversed, and minimized. To get clear and sharp photo images, the camera needs to be focused. This focusing is done by changing the position of the lens to the object according to the distance of the object to be photographed.
The film plate, serves as a place of shadow and produces a negative image, which is a color image that is not the same as the original, translucent.
In a simple camera, the position of the lens can only be done if the user moves near or away from the object until the desired image is obtained. Along with the development of technology, in a more modern camera, the position of the lens can be changed by turning the lens control ring. Even at the latest, the lens position can be adjusted with digital technology.
The film plate uses a celluloid plate coated with gelatin and silver bromide to produce the negative. After washing, the negative is used to produce a positive image (original image) on photo paper. Photo paper is paper that is covered with a thin layer of colodium mixed with silver chloride. Images generated in transparent fields are called diapositive images.
A prism is used on some modern single lens reflex cameras (SLRs). In this type of camera, a prism is used to deflect light so that it can rotate around the inside of the camera so the photographer can see the actual image that will be taken through the camera lens.
Shutter or cover is a component that allows the passage of light through the lens in a short time. To get a good shot, you can slide the lens back and forth until the clearest image is formed with the right distance, then you press the shutter button.
Aperture functions to regulate the size of the diaphragm.