The positions of these images on the screen completely reflect the state of collimation or miscolimación the instrument. Then the light rays emerge back from the eyepieces and project on the screen two images of the lamp. Light rays that come out of the lamp enter the eyepieces and go through the binoculars twice after been reflected by the mirror at the objectives. These components are so positioned that the binoculars project two images of the lamp on the screen. The method uses a setup consisting of a small pocket lamp, a semi-transparent screen and a mirror. Once collimation is accomplished, the two optical axes are parallel at any interpupillary distance of the instrument. A method to check and adjust the collimation of binoculars provided with a collimation system, either by eccentric rings to displace the objective lenses or screws to modify the position of the prisms is described.
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