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Giovanni Battista Benedetti, a patrician of Venice, 1530–90, published at Turin a book called Diversarum Speculationum Mathematicarum et Physicarum Liber, “A Book of Various Mathematical and Physical Speculations”, in which was included the first complete and clear description of the camera obscura equipped with a lens. The date of the volume was 1585, four years before Porta published his revised edition.

Benedetti used a double convex lens. His first knowledge of optics came from a study of Archimedes, whom he admired greatly. But his learning was not confined to optics. He influenced the great Descartes in geostatics, studying the laws of inertia and making the contribution of the path taken by a body going off from a revolving circle, i.e., tangent. In 1553 he reported that bodies in a vacuum fall with the same velocity.

Benedetti’s description of the camera obscura included details on how to make the images appear upright. The material is contained in a printed letter to Pierro de Arzonis. First Benedetti discusses light and the fact that a greater light overshadows a smaller, “just as by day the stars cannot be seen.” He then pointed out that if the light were controlled in a camera the outside images could be seen, but if the rays of the sun were allowed to enter (as by making the opening hole too large) then the images would “more or less vanish according to the strength or weakness of the solar rays.”