Found a source for a cheap fresnel lenses to be used on ground glass. They are not exactly the right size (5 1/4" X 3 3/4"). However, they work fine f or $1.18. They can be trimmed. Go to WWW.JACKSONOFFICESUPPLIES.COM (Phone: 800-5 98-2736) Item Code 04139 Card Lens, Clear Color @ $1.18 each
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