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Awarded the APS 2001 J. F. Lewis Award.

Sometime between 1028 & 1038, Ibn al-Haytham completed his monumental optical synthesis, Kitab al-Manazir (Book of Optics). By no later than 1200 this treatise appeared in Latin under the title De aspectibus. In that form it was attributed to a certain "Alhacen." These differences in title & authorial designation are indicative of the profound differences between the two versions, Arabic & Latin, of the treatise. In many ways, in fact, they can be regarded not simply as different versions of the same work, but as different works in their own right. Accordingly, the Arab author, Ibn al-Haytham, & his Latin incarnation, Alhacen, represent two distinct, sometimes even conflicting, interpretive voices. And the same holds for their respective texts. To complicate matters, "Alhacen" does not represent a single interpretive voice. There were at least two translators at work on the Latin text, one of them adhering faithfully to the Arabic original, the other content with distilling, even paraphrasing, the Arabic original. Consequently, the Latin text presents not one, but at least two faces to the reader. This critical edition represents 14 years of work on Dr. Smith's part.  In Latin & English. Vol. 1: Intro. & Latin texts (hardcover); Vol. 2: English Translation.