When the camera moves perpendicular to the optical axis, will the right angle in the photo change?

Large format cameras, especially monorail cameras, have a very flexible function of shifting axes. Generally, the optical axis of the photographic lens of a small camera has a fixed vertical cross relationship with the center of the picture. But the optical axis of large format camera can be moved and the angle can be changed. Through such shifting and adjustment, the left, right and upper viewpoints of the camera can be changed within a certain range without moving the camera.

For example, you can shoot a mirror object from the front without distorting the object or making the photographer and camera appear in the mirror of the picture. In the case of limited site conditions, some obstacles can be avoided. By adjusting the inclination and deflection of the front group and the back group, some shooting technical problems can be handled skillfully. For example, we can selectively focus on a certain part of an object to make it clear, while blurring other parts and emphasizing the main goal. The geometric perspective effect of the subject is purposely reduced or exaggerated to achieve a special shooting effect. Because the front and rear panels of large-format cameras can move and tilt, they can shoot extremely clear pictures from the photographer's feet to infinity, which is why many landscape photographers at home and abroad who pursue perfect style mostly use large-format cameras. Operation method:

1, select the most suitable shooting point; Set the camera for composition;

2, focusing and adjusting the viewing angle, the most basic adjustment of the back camera is leather cavity adjustment, which is used to change the distance from the lens to the film; By gently sliding the front and rear frames forward or backward, you can focus on a specific object accurately. Although it is possible to focus through frosted glass or lens, it is generally more reasonable to focus with the back frame, because the distance from the lens to the object (that is, the magnification of the object) will change when the front frame moves; There are also coarse focus and fine focus. When the basic focusing is completed, it can be adjusted more accurately through fine focusing.

3. Adjustment: lifting adjustment, lateral displacement adjustment, yaw and tilt adjustment and standby rotation. The key point of adjustment: the extension of leather cavity-to meet the needs of long focal length lens and close-range shooting. Deflection and tilt backup of the camera-changing the shape of the image and controlling the viewing angle of the image; Deflection and tilt of the lens plate-control the focus clarity when the main plane of the subject is not parallel to the camera backup; Vertical and horizontal adjustment of lens plate-helps the image to focus on the center of the film; Backup rotation-the imaging position of the subject on the film can be adjusted without moving the camera. After the focal length, perspective and composition are completed, fix the camera firmly (avoid hitting the camera or shaking), and then measure the light.