Optical Plummet

The focusing device of optical plummet is similar to the inside focusing telescope. Rotate focusing hand wheel of eyepiece, make reticle in focus, this process is called focusing for reticle board. Rotate focusing hand wheel in order to make the imaging of target point that is on the reticle board is in focus, too. In addition, reticle is required to go through the prism on structure, and should go through the center of the object lens after turning.