I've heard of camera obscura but never camera lucida. This old technology will soon make a modern comeback imo. Thanks to Odin (other forum I frequent), I share this info here. Almost makes a lazy filter guy want to give it a try (I did say almost; lololol). 
http://www.wired.com/design/2013/06/...-21st-century/
Main website: http://neolucida.com/design/

http://www.wired.com/design/2013/06/...-21st-century/
Main website: http://neolucida.com/design/