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2. Black Widow (paint mix) - Wikipedia

   en.wikipedia.org/wiki/Black_Widow_(paint_mix)

   Black Widow (also known as a Black Widow Ultra in Europe) is a non-commercial open source project to design a paint mix for the base of a DIY projection screen.Anonymous DIYers responsible for popularizing Black Widow in the DIY community include Mechman Alternators (US), Wbassett (US) and Custard10 (EU). [1]

3. Enlarger - Wikipedia

   en.wikipedia.org/wiki/Enlarger

   All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat [citation needed] could be used in both camera and enlarger.

4. Holographic screen - Wikipedia

   en.wikipedia.org/wiki/Holographic_screen

   A holographic screen is a two-dimensional display technology that uses coated glass media for the projection surface of a video projector. "Holographic" refers not to a stereoscopic effect, but to the coating that bundles light using formed microlenses. The lens design and attributes match the holographic area.

5. TikTok users are making 'homemade hologram projectors' with ...

   www.aol.com/news/tried-making-tiktok-famous...

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6. Why can’t you look at the eclipse? Here’s how to DIY safe ...

   www.aol.com/eclipse-glasses-home-yes-where...

   To make one of these projectors, all you need is a small cardboard box the size of a cereal or shoe box, a white sheet of paper, tape, scissors, aluminum foil, and a push pin.

7. Eclipse eye safety: How to make a pinhole projector, test ...

   www.aol.com/eclipse-eye-safety-pinhole-projector...

   For those without access to eclipse glasses, a pinhole projector is another way to safely view the eclipse. With a pinhole projector, viewers will not face the eclipse, but rather stand with their ...

8. Photographic lens design - Wikipedia

   en.wikipedia.org/wiki/Photographic_lens_design

   Projector lenses have to be very tolerant of prolonged high temperatures from the projector lamp and frequently have a focal length much longer than the taking lens. This allows the lens to be positioned at a greater distance from the illuminated film and allows an acceptable sized image with the projector some distance from the screen.

9. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .