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Does a fresnel lens have a particular side you need to use when making a projector?
I tried to build a DIY projector out of a lens I got out of a overhead projector and an old CRT monitor, and it worked, but the image I got had terrible pincushion distortion?
Is it possible I put the lens in backwards? Would putting a piece of cardboard with a hole in it to stop down the lens help with the distortion or make the image appear sharper?