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Spherical glass vs parabolic acrylic
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[QUOTE="OmCheeto, post: 6028567, member: 103343"] Can't help you with your specific problem of finding a cheap "concave" lens, but you might want to experiment with a "convex" lens. I discovered last Halloween that a vehicle's windshield produced almost the same effect, when shining into my living room. Here's what I witnessed when I put an oil lamp in line with the light, and took an image on my living room wall: [ATTACH=full]228201[/ATTACH] Kind of "dollar store-ish". But still, kind of fun. [/QUOTE]
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