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Earlier prism type camera lucidas had (and the ones today still have) an unstable and elusive image. As David Hockney noted "You must use it [prism type Camera Lucida] quickly, for once the eye has moved the image is really lost.( Secret Knowledge, pg 24)"
Later mirror type camera lucidas have a more stable image, but they are often only suspended by a thin rod that wobbles back and forth as you try to draw.
The LUCID-Art has the more stable mirror type lucida image and is supported by a solid mechanical arm that is steadied by a second diagonal cross support arm; thus, eliminating wobbling and giving you the most stable image possible, while ensuring that the support arms will not get in your way as you draw.
The image is still a virtual image, so it will move if your head moves, but you will have a solid place to anchor your head. And if you move your head or want to take a break, then you can easily line your marks back up with the image and continue drawing.
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