The accuracy of target alignment using the Hartmann test was measured by the glass microballoon perforation (Snout) test. We find a 45-μm rms pointing error, most of which is random.
© 1978 Optical Society of America
Robert F. Benjamin, Philip D. Goldstone, and James P. Carpenter, "Direct measurement of the accuracy of CO2laser alignment on target," Appl. Opt. 17, 3809-3811 (1978)