Selectable Offset Image Wedge

A method of mounting at least one selectable offset image wedge for repeated use with an optical system having a circular lens and an objective, comprising the steps of:

• a. mounting said at least one wedge adjacent said objective;
• b. mounting a locking mechanism onto an adapter;
• c. aligning an optical system reticle with a vertical line in a field of view using a rifle at a fixed position;
• d. mounting said at least one wedge onto the adapter;
• e. adjusting said at least one wedge to align an image of the vertical line with a vertical axis of the reticle;
• f. adjusting the locking mechanism against a wedge cell to provide a positive stop when said at least one wedge is loosened and locked in the fixed position;
• and
• g. locking the locking mechanism.

A method of making a selectable offset image wedge for use with an optical system having a circular lens and an objective, comprising the following steps:

• a. polishing two plates of glass to an approximately same size and shape, said two plates having a first side and a second side defined by a direction of transmitted light;
• b. combining said two plates in opposite directions, such that said transmitted light enters the first side and second side and exits the second side and first side of said two plates, respectively, with no separation of color;
• c. then a first of said two plates is cut into circular form for tight insertion into a cell;
• d. then a second of said two plates is cut into circular form slightly smaller than the first and placed adjacent the first at a tilt within the cell to avoid interference of said transmitted light;
• e. then the two plates are bonded together using cement and collimated red and blue light, forming a cemented wedge, said cement being cured while two color images are superimposed one on the other;
• f. the cell is then positioned between a collimated target and a theodolite with an index mark aligned vertically in the direction of transmitted light;
• g. then the cemented wedge is aligned in the cell such that a target is displaced only on a vertical axis, forming a selectable offset image wedge;
• and
• h. the selectable offset image wedge is then bonded in place.