Printable View
Rainaway camera lens.
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Previously:
Grinding an optical glass lens - GIF
Light passing through different lenses - GIF
Macro camera lens - photo
Manual focus lens cutaway - photo
Short-throw projector lens - photo
Clear view screens have been around for over 100 years...
You can get these for CNC machines and they're awesome. Normally a window gets completely coated in coolant and you can't see anything. This is pretty much the only thing that'll actually allow you to see the workpiece in a lot of cases.
https://www.youtube.com/watch?v=lYAnOheWHEA
This guy has a screwtube channel that's entertaining and informative. He often takes apart power tools to explain whether they are properly designed.