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Baz.
If you put a clear sheet in the optical train it will change the focus point. You have to cut the slots out so there is only air and not plastic between the lines. This is difficult to do with clear sheeting. I printed a mask in paper, glued it to some 3mm foam board and then cut that out with a craft knife. Took about 30mins but works a treat and cost about $3 for the foam board.
Try a clear sheet vs nothing and you will see a change in the focus. Similar to trying to take an image through a window.
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