Abstract: A collimator gun sight is formed of a solid block of glass with plane parallel opposite end faces. A partially reflecting concave surface in the block forms an image at infinity of a graticule pattern which is illuminated by light entering the block through a window. The block is made from a rod with plane end faces and a lens doublet element cemented to one face.

Abstract: A collimator gunsight has a collimator lens, a transparent graticule in the focal plane of the lens, and a window behind the graticule. A small artificial light source is positioned between the graticule and the window but does not obscure the ambient light entering the window from illuminating the graticule. The graticule pattern has a first portion through which light from the artificial source can pass into the aperture of the collimator lens, and a second portion which diverts, e.g. by refraction, ambient light entering the window and by-passing the artificial source so as to fill the aperture of the lens.