Patent ID: 8431881

Claim:
A system comprising: a night vision module comprising: a module housing having a first end, a second end, and a camera port; an image intensifier that receives energy through the first end and generates an intensified image; a pellicle situated in the optical path between the image intensifier and the second end so that the camera port and the second end receive substantially identical intensified images, wherein the module housing further comprises an attachment port adapted for removably attaching an outer optical module in a position that adds to the horizontal field of view of an eye at the second end of the night vision optical module; and an outer optical module, removably attached to the night vision optical module and comprising: a housing having a first end and a second end; and an image intensifier situated in the housing that receives an image through the first end and passes an intensified version of the image out through the second end; wherein when the outer optical module is attached to the night vision optical module, expands the horizontal field of view of that optical module.