<P> The camera obscura's potential as a drawing aid may have been familiar to artists by as early as the 15th century . </P> <P> The oldest known published drawing of a camera obscura is found in Dutch physician, mathematician and instrument maker Gemma Frisius' 1545 book De Radio Astronomica et Geometrica, in which he described and illustrated how he used the camera obscura to study the solar eclipse of January 24, 1544 </P> <P> Italian polymath Gerolamo Cardano described using a biconvex lens in a camera obscura in his 1550 book De subtilitate, vol . I, Libri I - VII, </P> <P> Sicilian mathematician and astronomer Francesco Maurolico (1494 - 1575) answered Aristotle's problem how sunlight that shines through rectangular holes can form round spots of light or crescent - shaped spots during an eclipse in his treatise Photismi de lumine et umbra (1521 - 1554). However this wasn't published before 1611, after Johannes Kepler had published similar findings of his own . </P>

Who was the first famous painter who used camera obscura to sketch