An autostigmatic microscope is described and its uses explained. Then an adaptation of the original instrument is
described that uses current technological advances in laser diodes and video displays to turn an old workhorse into a
versatile optical test and alignment device. This paper illustrates applications that make use of the capabilities of the
modern autostigmatic microscope outside the field of aligning optical systems such as using it as an electronic
autocollimator, a check on the centration of the axes of molded optics and the measurement of the runout and
wobble of precision spindles such as air bearings.