Holographic weapons sights have become increasingly popular with shooters, as they give the shooter the ability to quickly lock in on target, even if the shooter’s head position is not aligned with the sight.
With a conventional optical scope, a shooter must have his eye aligned with the scope in order to place the reticle over the target. If the shooter’s head isn’t perfectly aligned, the scope’s reticle isn’t pointing to the same spot on the target as the gun.
With a holographic (“holo”) sight, the reticle is always on the spot on the target where the weapon is pointed. Move the gun left or right, and the reticle moves as well, but is still on the point of aim.
How is this possible?
Unlike the view you see through a conventional scope, what you are seeing through a holographic sight is not real. It’s a reconstruction of the view. What’s more, the reticle that you see is not actually in the sight, but is a projection of a reticle image.
Before you start scratching your head, think about watching a movie. The movie camera has recorded the the light reflected from the objects in a scene onto...