Briefly describe the basic principle of oblique photography.

Tilt photography is a photography technique that photographs the ground or buildings by tilting the camera lens. Its basic principle is to keep the photographic plane perpendicular to the object plane by tilting the camera lens, so as to avoid perspective distortion and present the shape and details of the object more accurately.

The basic principle of oblique photography includes the following key elements:

1, camera tilt angle: camera tilt angle is very important in tilt photography. By adjusting the tilt angle of the camera lens, the photographic plane can be kept perpendicular to the ground, thus avoiding perspective distortion. The choice of tilt angle needs to be determined according to the characteristics of the subject and the shooting needs.

2. Optical axis tilt: In tilt photography, the tilt of the optical axis corresponds to the tilt angle of the camera. By tilting the optical axis, the vertical plane of the subject can be kept perpendicular to the photographic plane, further reducing the perspective distortion. The tilt angle of the optical axis can be adjusted by a professional tilt lens.

3. Lens shift: In oblique photography, lens shift is an important technical means. By adjusting the horizontal translation and vertical translation of the lens, the subject can be reasonably composed and the vertical relationship between the shooting plane and the subject can be maintained. Lens shifting can be achieved by professional tilting lens or axis shifting lens.

4. Shooting distance and focal length: In oblique photography, shooting distance and focal length are also factors to be considered. By choosing the appropriate shooting distance and focal length, the required depth of field and picture effect can be obtained.

The basic principle of oblique photography enables photographers to record and present the shape and details of the subject more accurately. This has important application value in architectural photography, geographical survey, urban planning and other fields. Tilt photography can not only provide accurate measurement data, but also present a more realistic and three-dimensional picture effect, which provides a better working tool for professionals.

In a word, tilt photography can keep the vertical relationship between the photographic plane and the object by tilting the camera lens, adjusting the optical axis and moving the lens, thus avoiding perspective distortion and providing more accurate and stereoscopic shooting results. The basic principle of oblique photography has been widely used in various professional fields, providing photographers with more possibilities for shooting and measuring.