These looked useful: http://www.clarkvision.com/photoinfo/evaluating_polarizing_filters/ http://singhray.blogspot.com/2006/10/from-archive-gold-n-blue-polarizer-can.html http://www.mat.uc.pt/~rps/photos/filters_uv_pol/ These are great...
![[No title]](/data/xfmg/thumbnail/32/32639-1358bee897449f9a4a38676097b475d5.jpg?1619735555)
![[No title]](/data/xfmg/thumbnail/36/36651-948fc64542c147745d3f3c48bce31dce.jpg?1619737673)
