| 摘要 |
The present invention relates to an optical sighting system for a firearm that basically comprises a concave meniscus sighting lens of approximately zero power and fully transparent located off the optical axis, and a light source located on the optical axis generally disposed at the reflective focal point of said lens, generally between the lens and the observer's eye. The lens is operative to reflect two coinciding images of the light source towards the observer's eye, and this gives rise to an appearance where the image of the light source appears at infinity and in focus on the sighted target.
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