I could not determine the amount of exposure correction on a sunny day with a po larizer. Looking back, I guess I should have used my incident meter with a shor t piece of toilet paper core, gotten a reading with the tube open, and then a re ading with the polarizer covering the end of the tube, rotating the polarizer, a nd noting the difference in illumination (e.g., 1 stop difference, 1 and a half stop difference, etc.). Any suggestions?
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