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These optical filters are known as edge filters; they correspond to high and low passes in electronics.
Very steep edge filters with excellent flatness.
Can be separated into short and long wave passes.
By using proprietary 'Quasar' technology, the transition in both SP and LP filters between the 50% cut-off or cut-on to rejection is quite sharp.
Dichroic filters: Heat permeability and heat reflection usually at an angle of incidence of 45°.