Supplementary sight aid adaptable to existing and new scope

1. A sight aid for aiding aiming and zeroing of a projectile device with respect to a target, said sight aid comprising:

(a) a telescope comprising a housing, an objective lens mounted in the housing at one end thereof for forming a target image, an ocular lens mounted in the housing at an opposite end thereof and having image-erecting optics, a reticle mounted within the housing, wherein the objective and ocular lenses define an optical axis through the housing and the image-erecting optics are mounted between the objective and ocular lenses on the optical axis for erecting the image formed by the objective lens, where the erected image is formed for viewing by a user, the reticle having a sight alignment indicator on the optical axis, an image thereof being aligned with the target image formed by the objective lens and the image-erecting optics within the housing to facilitate alignment of the telescope with the target;

(b) a projection plane, a projection device, a supplementary sight alignment indicator and at least one reference point projected by said projection device on said projection plane, wherein said supplementary sight alignment indicator is axially-centered with respect to the sight alignment indicator and spaced apart therefrom on the optical axis for forming a composite image with said image of said sight alignment indicator, said target image being viewable together by the user by means of the ocular lens and wherein said projection plane is disposed at a distance from the sight alignment indicator and said projection plane is configured to allow direct line of sight of the target from the telescope; and

(c) at least one adaptor configured to secure said sight aid to a portion of at least one of the projectile device and the housing,

whereby an indication of deviation of said images of the axially-centered sight alignment indicator and axially-centered supplementary sight alignment indicator and said target image along the optical axis is provided to the user such that an action can be taken to remove such deviation to assure accurate alignment of the optical axis of said telescope with the target and at least one reference point at the target is superposed by said at least one projected reference point.

2. The sight aid of claim 1 , wherein said adaptor comprises screw type threads adapted to be coaxially and removably secured to mating screw threads of the housing with respect to said optical axis.

3. The sight aid of claim 1 , wherein said adaptor comprises a rail adaptor adapted to be removably and slidingly secured to a rail.

4. The sight aid of claim 1 , wherein said supplementary sight alignment indicator is a projected image selected from the group consisting of a cross, a dot, a ring, a line, a plurality of lines, a pin and any combinations thereof.

5. The sight aid of claim 1 , wherein said at least one reference point is a projected image selected from the group consisting of a cross, a dot, a ring, a triangle and any combinations thereof.

6. The sight aid of claim 1 , wherein said supplementary sight alignment indicator is a projected image shaped and sized substantially similar to the sight alignment indicator, so that, when a user's eye is centered on said optical axis, the image of the sight alignment indicator completely covers the image of said supplementary sight alignment indicator.

7. The sight aid of claim 1 , wherein said supplementary sight alignment indicator is a projected image shaped concentrically to the sight alignment indicator so that, when a user's eye is centered on said optical axis, said image of said supplementary sight alignment indicator is centered relative to the image of the sight alignment indicator.