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I'll add mine to all of the others that look the same.
Can't believe with all the filmfags around here no one mentioned using black and white film as a filter.
I took a roll of Foma 200 in 120, unrolled it in direct sunlight, baked it in Rodinal for 15 minutes and fixed. Used 2 pieces sandwiched for a viewer for my eyes, and a single piece to hold in front of the camera lens. Camera and eyes still working ok.