Model of aiming camera on arm back at origin with inaccuracy

2 Dimensional parametric model of the camera positioning and aiming. Our view of this diagram is looking at the end of the pivot axis so we see the full length of the arm, as it moves from to 90º elevation down to 0º elevation. This diagram does not model rotation about the Z axis, although I can add that once this is clear. Adjust the elevation, arm length, and camera offset angle with the three sliders.