4. Shift Function
Shifting moves the optical axis of the lens in parallel off the center of the imaging plane. Shift can be used to good effect in the situations shown below.
●If you photograph a subject such as a building with a normal lens, the top of the building tapers away. But by placing the camera parallel to the building and shifting the lens, you can correct this tapering effect.
●When you are shooting a reflective subject, you can move the camera to a position where the camera does not appear in the shot and then use shift to take the picture. This lets you keep the camera out of the shot without having to change the shot composition.