The beam is projected onto the workpiece by collimating and focusing optics. Cylindrical analogues of the Luneburg lens are also used for collimating light from laser diodes. Small molded aspheres are often used for collimating diode lasers. Some other telescope manufacturers use Takahashi refractors as collimating instruments for larger telescopes. This is effectively a point light source in combination with a collimating lens. They are also referred to as collimating sights or "occluded eye gunsight" (OEG).