First make sure that your light source is well-centered with the fresnel. Then ensure that it is distanced exactly at the focal length of the fresnel (typically 14", but some of the nicer ones are roughly 9"). Another thing to try is filliping over your fresnel lens. I don't know why this works, but sometimes it does. If you still are having trouble, then check the back of the projection lens while your projecting an image to make sure that none of the light is missing your projection lens - that can do some really weird stuff to a projection image.
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