Lens Shift

Lens Shift is not too dissimilar to keystone correction as it allows flexibility in positioning a projector.

As you might expect, lens shift refers to the physical movement of the lens inside the projector housing. This has the effect of moving the image left or right and up and down on the screen without having to move the whole projector and is a godsend when trying to ceiling mount a projector. It can also help to reduce hot spots created when using high gain screens.