What does lens shift mean?

The shift lens is standing on the ground when shooting the building. In order to take a complete picture, the camera should be tilted slightly upward. Because the lower part of the building is close to the upper part and far from the upper part, the convergence effect of "the lower part is big and the upper part is small" will be adopted. The lens itself is not deformed, and the reason for this phenomenon is the perspective relationship. Correction: The camera is shooting a building.

At this time, the lens angle may be insufficient, and it is necessary to change a lens with a wider angle. For a 35mm camera, the equivalent method is to shoot directly at the target with a lens with the same focal length but a larger viewing angle, and move the film to the reserved position when cutting (actually, the lens translates in the opposite direction). This kind of lens is the "axis-shifting lens", and the principle is as mentioned above.

Application of axis-shifting lens

Axis shifting lens is mainly used for architectural photography and advertising photography. 135 axis-shifting lens itself is less because of its special use, and there are also fewer DX and film in this respect. Tilt-shift photography refers to the works created through the shift lens, and the photos taken are as special as miniature models.

The function of shift lens was originally used to correct the perspective problems caused by ordinary wide-angle lens, but it was later widely used to create photographic works that changed the focus position of depth of field. Moving mirror photography is to make the real world confuse the false with the true, and let the photos fully show the feeling of "artificial city".