title: Microscope with enhanced depth of field and 3-d capability.
abstract: In the summer of 1969, R. L. Gregory was working at Bell Labs, and suggested one might be able to increase the effective depth of field of a microscope if, instead of making the objective achromatic, one arranged that the different spectral colors come to foci at different distances from the lens. J. S. Courtney-Pratt suggested that one might then be able to view the image in 3-D by use of a simple binocular eyepiece modified to give a convergence of the images that varied with the spectral color. A 16-mm NA 0.4 objective has been made that gives a lateral resolution of 1 micro and a depth of field of 100 micro. 3-D displays present sharp images of objects with dark field illumination with depth magnification at any chosen value up to+/- 4 10,000x.
authors.forename: J S
authors.initials: JS
authors.lastname: Courtney-Pratt
authors.forename: R L
authors.initials: RL
authors.lastname: Gregory