There was a Kickstarter done to build a modern camera lucida, they are still building batches of them (they even have DYI including prescription lucidas): http

There was a Kickstarter done to build a modern camera lucida, they are still building batches of them (they even have DYI including prescription lucidas): http://neolucida.com http://neolucida.com (not affiliated, just an art geek)