Pentaprism
A pentaprism is a fixed-angle (90°) beam deflector with two functions. First, regardless of the angle of incidence on its first face, it redirects the incident beam through a fixed angle (90°). Second, unlike a right-angle prism, it produces an image without rotation or mirror reversal. It is used in camera viewfinders and is particularly suitable for image-viewing systems and measuring instruments. A pentaprism cannot provide total internal reflection based on the critical-angle principle. Its two reflecting faces are therefore generally aluminum-coated and painted black, while its entrance and exit faces receive a single-layer MgF2 antireflection coating.
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Penta Prism is a five-sided prism containing two reflecting surfaces at 45° to each other, and two refracting faces perpendicular to the entering and emerging beams. The standard Penta Prism reflecting surfaces are coated with aluminum or enhanced aluminum.
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