Using Surplus Lenses from OHP

[funkychateau]

I have a like-new 3M overhead projector, and I'm deciding whether to scrap it for parts or hassle with selling it for the $30 or so they bring on Craigslist.

Fun can obviously be had with the large Fresnel, but are the two mirrors and the three glass lenses useful? What projects has anyone made with them?

 

[Walterk]

Toss in the LCD system (without the backlight ) from an old laptop or worktop screen and play Wolfenstein on the wall. (Google ''DIY LCD Projector'').