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With this issue we revive a practice once common in Optical Engineering-the inclusion of tutorial material in the SPIE Reports. This offers me a chance to say what I hope these tutorials can accomplish and to seek reader assistance in finding topics and authors for future tutorials.
H . J. Caulfield
"Editorial: Tutorial Materials In Optical Engineering," Optical Engineering 20(3), 203493 (1 June 1981). https://doi.org/10.1117/12.7972717