Prismatic Eyepiece Attachment for Telescopic Gun Sights
An attachment device that shifts the exit pupil position of a telescopic gun sight is introduced. The attachment includes a refracting wedge prism to tilt the viewing axis of the telescopic sight. This, in turn, shifts the position of the exit pupil of the telescopic sight and makes it possible to view the target image from an eye position offset from the sight's optical axis. The invention provides improved ergonomics for the shooter.
1 . An attachment device for use with a telescopic gun sight, comprising
a. a housing means, said housing means being substantially cylindrical in shape, said housing means being detachably mountable onto the eyepiece end of the telescopic gun sight, and
b. a wedge prism, said wedge prism having a predetermined apex angle, said wedge prism being mounted inside said housing means such that the light rays exiting from the telescopic gun sight pass through it
whereby an operator can aim through the telescopic gun sight from an offset eye position.
2 . The attachment device of claim 1 wherein said wedge prism is comprised of an achromatic prism.
3 . The attachment device of claim 1 wherein said housing means is made of rubber or similar elastic material such that it can snugly fit onto the eyepiece end of a telescopic gun sight.
4 . The attachment device of claim 1 wherein said housing means is made of aluminium or a similar light metal.
5 . The attachment device of claim 1 wherein said housing means is made of plastic or a similar synthetic material.
6 . The attachment device of claim 1 wherein said housing means further includes a clamp for attaching it onto the eyepiece end of a telescopic gun sight.
7 . The attachment device of claim 1 wherein said housing means further includes screw threads for attaching it onto the eyepiece end of a telescopic gun sight.