I am scanning 4x5 transparencies with an HP5370c scanner. I believe I need to us e a piece of glass to get the film to lay flat. The scans are of better quality than expected, however, I am getting what I believe are called newtons rings. I also believe this is due to the quality of glass? Is there something I can use, or a specific grade of glass I can purchase to solve this problem?
Thanks- Jon
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