R5 viewfinder camera has two more vertical lines.

that's a horizontal line, through which you can judge whether it is in a horizontal state.

A camera is a kind of equipment that uses the principle of optical imaging to form images and records images with negative film. It is an optical instrument used for photography. In modern social life, there are many devices that can record images, and they all have the characteristics of cameras, such as medical imaging equipment and astronomical observation equipment. After the light reflected by the photographed scene is focused by the camera lens (the camera lens) and the shutter that controls the exposure, the photographed scene forms a latent image on the photosensitive material in the camera box, which is developed and fixed to form a permanent image. This technology is called photography and is divided into general photography and professional photography.