What are the characteristics of shift lens?

A lens that moves the optical axis to adjust the viewing angle. The function of the shift lens is not only to correct the perspective deformation, but also to adjust the focal plane position. In general, the focal plane of the camera is parallel to the film plane, and the scene in the focal plane is clear and the Jiao Wai is blurred when shooting with large aperture; If the focal plane is adjusted by moving the axis lens, the sharpness can be changed. Obviously, shifting lens is most suitable for architecture, landscape and commercial photography. EF shift lens has no AF function.

This kind of lens is designed to be movable because it has a special device that can move or tilt, and the focal length is generally 28mm or 35 mm