ماهي الأجهزة المستخدمة لتعيين المنظر في الكاميرا .. كتاب آلات التصوير

What devices are used to set the view in the camera?

The first cameras featured direct viewfinders. There was a glass screen at the back in place of the glass slide, showing the image formed by the lens. This device is still used in modern cameras. The presence of an optical frame or lens helps the photographer to see the field of view in the camera continuously, but it does not show the image issued by the camera lens completely. There is another third device that reflects the image on the vision screen, which is usually mounted horizontally. Reflective vision is...

What do we mean by reflected vision and focus focus? There are two main types of reflex cameras, the single lens reflex and the dual lens reflex, with other subdivisions each having a waist-level reflex and an eye-level reflex. The single-lens reflex image contains one lens, as is evident from its name, and this lens is not only used to produce the image on the film, but also for the image of vision and focus. Behind the lens there is a separate reflecting mirror placed at an angle of 45 degrees to the optical axis, and this mirror reflects the image from the lens onto the screen at the same distance from the lens as the film (Fig. 5). The screen is usually about the same size as the film image area, so that the visual image on the screen is actually similar to that shown on the film - and in practice the screen usually shows a lesser part of what actually appears on the film.

Focusing the focus of the lens to make the image on the vision screen clear, leads to focusing it also in relation to the film level, and because of the wide accurate vision image, it is possible to determine the frame of the subject to be photographed with its composition and organization. If the camera is compatible
To install and exchange lenses and it was equipped with a lens with a different focal length, that the change in the size of the image and the area of ​​​​the subject to be photographed will be noticed immediately. And if a filter, a telephoto lens, or any other optical accessory is installed, the effects of this can be studied
A chain of events occurs from the moment the woman intercepts the path of light from the lens to the film, and therefore must be moved in order for the image to be captured. Since the lens is also set to its maximum possible aperture to obtain the brightest image of the vision. It must be closed down slightly to secure the correct exposure or to adjust the depth of field. Both of these changes must be made before the shutter opens. There is a special tool that loves to correct operations in a fraction of a second, starting when the shutter release mechanism is pressed and then the shutter opens. In most modern cameras, the mirror returns to its position in the lens, the path of the film light, and the film opens. The entire lens diaphragm shutter. It is clear that the image of the vision is absent at the moment when the actual exposure is made. again as soon as the pronunciation is done

Some old cameras are distinguished by the presence of a mirror in it that is manually operated by the shutter release mechanism, as the process of pressing the release mechanism raises the shutter. Diaphragms that close automatically and then open again are considered modern inventions, and their rapid operation is achieved by making the separations of the different tongues under spring tension.