| Abstract: | A direct view telescopic sight includes objective lens, eyepiece, and
prism erector assemblies. The objective lens assembly is mounted to
receive light of an image from an object direction and direct the light
along an optical path. The eyepiece assembly is mounted to receive the
light along the optical path and to emit the light of the image along an
eye-ward direction. The prism erector assembly is positioned between the
objective lens and eyepiece assemblies and includes first and second
prism elements through which the optical path passes. The first and
second prism elements invert the image. A reticle element is disposed on
or adjacent to a surface of one of the first or second prism elements to
combine a reticle on the image. The image is brought into focus at only a
single focal plane between the objective lens and eyepiece assemblies at
a given time. |