Comparison : Item # 0009-5165, KRS-5 25mm Wire Grid Polarizer
Item # 0009-5169, Calcium Fluoride 25mm Wire Grid Polarizer
Item # 0009-5170, Barium Fluoride 25mm Wire Grid Polarizer
Item # 0009-5171, Zinc Selenide 25mm Wire Grid Polarizer
Item # 0009-8429, KRS-5 50mm Wire Grid Polarizer