Which renaissance painter was also the author of the art-theory treatise on perspective for painting?

Leon Battista Alberti

De pictura (English: "On Painting") is a treatise or commentarii written by the Italian humanist and artist Leon Battista Alberti.

answer; i believe the correct answer is ( it gives the photographer greater control over the print)

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.