Camera lucida
Optical drawing aid / From Wikipedia, the free encyclopedia
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For the 1980 book by Roland Barthes, see Camera Lucida (book).
A camera lucida is an optical device used as a drawing aid by artists and microscopists.
The camera lucida projects an optical superimposition of the subject being viewed, onto the surface upon which the artist is drawing. The artist sees both scene and drawing surface simultaneously, as in a photographic double exposure. This allows the artist to duplicate key points of the scene on the drawing surface, thus aiding in the accurate rendering of perspective.