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That dog bowl will be crappy because of the huge flat spot on the bottom.
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Hehe, I guess an experiment should use the proper equipment. Where did you get your cake pan reflector?
I've been thinking about something else. I'm wondering how you could adjust the lens to overcome the parallax error. Ideally, the projector lens would be at the same vertical and horizontal position as the center of the screen. Anything else and the image will be larger on one side than the other. In my room I'd like to mount a projector from the ceiling, but the center of the image would be about 24" below the lens. We have an LCD projector at work, I'll have to see how it's done.
For the adventurous, here's a link to
a water cooled HPS lamp.