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Types of cameras.. the single-lens reflex camera..

2 - Single Lens Reflex Camera

This camera has solved the two problems mentioned above, i.e. the problem of the viewfinder with a small image, and the problem of the difference in view. Figure 7 shows a sectional illustration of a single-lens reflex camera:
Light enters the camera from the left as shown by the line, and a mirror reflects it upwards, then a special prism called pentaprisme reflects it backwards. Thus, when the photographer looks through the viewfinder, he sees the image through the camera lens itself. Some of these cameras make it possible to see the scene without changing its scale, i.e. its real dimensions. In all cases, the image seen here through the viewfinder is much larger than the image seen through the viewfinder of a regular 35 mm camera.
There is also no parallax problem in this type of camera, and the visible image is large enough to accurately focus and compose the image.
When we press the shutter button, the woman rotates upward, making way for the light to fall on the film through the shutter.

Although most reflex cameras use 35 mm film, some reflex cameras use 2 1/4 x 2 1/4 inch (photo 8). Due to the large area of ​​the film, a prism is not used in it, and the image reflects that on the shooting screen at the top of the camera rather than horizontally. This type of machine is held at the level of the photographer's waist as it is
The case is in the two-lens reflex cameras, which we will discuss later. On it can be added
A prism for this camera, and aiming at eye level, as is the case with a 35 mm reflex camera.