Constructed from polymeric plastic where the molecules are stretched and oriented in a specific direction so as to linearly polarize light, Dichroic Sheet polarizers are vulnerable to heat, warping and deterioration from moisture. They also have greater light absorption than Calcite Polarizers.
Plastic polarizers often need replacing after just 3 to 5 years. The Glan Thompson Calcite polarizers have a carbon crystalline structure similar to diamond and are guaranteed over the life of the polarimeter.
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