Scope turret

1. A rifle scope comprising:

a scope body;

a movable optical element defining an optical axis connected to the scope body; a turret having a screw defining a screw axis and operably connected to the optical element for changing the optical axis in response to rotation of the screw;

a guide surface wrapping about the screw axis and terminating at first and second ends;

a follower element operable to engage the guide surface, and to engage the first and second ends, the engagement of the first and second ends defining rotational limits of the turret; wherein each of the first and the second ends are at different radial distances from the screw axis; and

a rotation indicator coupled to the follower element that moves outward from the turret each time the turret is rotated between the first and second ends of the guide surface.

2. The rifle scope of claim 1 wherein the guide surface is defined by a channel.

3. The rifle scope of claim 1 wherein the guide surface includes a plurality of concentric arcs each centered on the screw axis and substantially encompassing the screw axis, the guide surface including a transition segment connecting an end of a first one of the plurality of concentric arcs to an end of a second one of the plurality of concentric arcs, such that a stepped spiral is formed.

4. A rifle scope comprising:

a scope body;

a movable optical element defining an optical axis connected to the scope body;

a turret having a screw operably connected to the movable optical element for adjusting the optical axis in response to rotation of the screw;

a first stop surface positioned for engagement by an element to limit rotation of the turret, such that the position at which the element engages the first stop surface defines a zero position of the screw and the movable optical element;

a second stop surface positioned for engagement by the element to limit rotation of the turret, such that the position at which the element engages the second stop surface defines a maximum point of displacement of the screw and the moveable optical element;

wherein the first stop surface and second stop surface are connected by a channel;

wherein the channel overlaps itself at least partially; and

a rotation indicator coupled to the element that moves outward from the turret each time the turret is rotated.

5. The rifle scope of claim 4 wherein the element is a cam pin.

6. The rifle scope of claim 4 , wherein the turret is a windage turret.

7. The rifle scope of claim 6 , further comprising a second windage turret.

8. A rifle scope with spiral cam turret mechanism:

a scope body;

a movable optical element defining an optical axis connected to the scope body;

an elevation turret having a screw operably connected to the movable optical element for adjusting the optical axis in response to rotation of the screw;

the elevation turret having a knob operably connected to the screw to adjust the position of the screw;

the elevation turret having a first stop surface positioned for engagement by an element to limit rotation of the elevation turret, such that the position at which the element engages the first stop surface defines a first limiting position of the screw and the movable optical element;

the elevation turret further having a second stop surface positioned for engagement by the element to limit rotation of the elevation turret, such that the position at which the element engages the second stop surface defines a second limiting position of the screw and the moveable optical element;

and wherein rotation of the screw causes the screw to move generally perpendicular to the optical axis; and

an elevation indicator connected to the element, wherein the elevation indicator moves outwards from the elevation turret each time the element passes through an angular transition segment.

9. The rifle scope of claim 8 : wherein the first stop surface and second stop surface are defined by a groove.

10. The rifle scope of claim 9 , wherein the groove overlaps itself at least partially.

11. The rifle scope of claim 9 , wherein the groove comprises multiple circular arc segments concentric on a central axis, wherein each of the circular arc segments are joined by angular transition segments.

12. The rifle scope of claim 11 , wherein the element is a cam pin received by the groove.

13. The rifle scope of claim 8 , further comprising indicia on the knob, wherein each of the indicia corresponds to a click stop position.

14. A rifle scope with spiral cam mechanism comprising:

a scope body;

a movable optical element defining an optical axis connected to the scope body;

a turret having a screw operably connected to the movable optical element for adjusting the optical axis in response to rotation of the screw;

an outer knob operably connected to a first set of teeth and to the turret such that the outer knob is movable between a locked position wherein the turret cannot be rotated and an unlocked position wherein the turret can be rotated;

the spiral cam mechanism operably connected to a second set of teeth;

the spiral cam mechanism defining a first stop surface positioned for engagement by an element to limit rotation of the turret, such that the position at which the element engages the first stop surface defines a zero position of the screw and the movable optical element;

the spiral cam mechanism defining a second stop surface positioned for engagement by the element to limit rotation of the turret, such that the position at which the element engages the second stop surface defines a maximum point of displacement of the screw and the moveable optical element;

wherein the first stop surface and second stop surface are connected by a channel;

wherein the channel overlaps itself at least partially; and

a rotation indicator connected to the element, wherein the rotation indicator moves outwards from the turret each time the turret is rotated;

wherein the outer knob is in a locked position when the first set of teeth are engaged with the second set of teeth and the outer knob is in an unlocked position when the first set of teeth are disengaged from the second set of teeth.

15. The rifle scope of claim 14 wherein the element is a cam pin.