Pentaprism beamsplitters are constructed by gluing a precision pentaprism and a wedge prism together, using an appropriate interference coating on one of the traditional reflective surfaces. Since slight movement of the pentaprism does not affect the true right angle at which light is reflected, the deviation between transmitted and reflected light is highly controllable and does not vary by more than 10 arc seconds.
Pentagonal prisms cannot achieve internal total reflection based on the critical-angle principle. Therefore, the two reflective surfaces of this prism are generally coated with aluminum film and black paint, and the incident and outgoing surfaces are coated with MgF2 single anti-reflective coating.
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