This is compensated for by keeping the dot in the middle of the optical window ( sighting down the sight's optical axis ).
32.
The telescope converts a bundle of parallel rays to make an angle ?, with the optical axis to a second parallel bundle with angle ?.
33.
The further off-axis ( or the greater the angle subtended by the point with the optical axis ), the worse this effect is.
34.
Binocular stereo vision method requires two identical cameras with parallel optical axis to observe one same object, acquiring two images from different points of view.
35.
But because the delivery fiber is offset from the optical axis of the lens, the beam is delivered to the sample at an oblique angle.
36.
Coma occurs when an object off the optical axis of the lens is imaged, where rays pass through the lens at an angle to the axis ?.
37.
The optical axis is often coincident with the system's mechanical axis, but not always, as in the case of off-axis optical systems.
38.
The amount of aberration due to astigmatism is proportional to the square of the angle between the rays from the object and the optical axis of the system.
39.
The optical axis in OAGs can be modulated in either transverse or the longitudinal direction, which causes it to act as a diffractive or a reflective component.
40.
A series of measurements with the tester, finding the radii of curvature of the zones along the optical axis of the mirror ( Y-axis ).
