Telescope system for a laser level

Galilean telescope systems with a magnification of 20X and 50X for focusing laser radiation at various distances have been developed, fabricated, and tested with objectives having anf number of K = 2.6, in which the spherical aberration is compensated by means of aspheric sinterform correctors. The exit aperture of the devices is 35 mm, the length along the axis is about 9 5 mm, and the working distances range from 0.4 to 150 m. (C) 2001 The Optic al Society of America.