Penta Prism is a Five –Side prism, It has two important properties ,First the image is neither inverted nor reverse while deviated by 90 degree. Secondly, It is a constant deflection device ;i.e all the transmitted rays are deviated by the same exact 90 degree. Slight movement of the prism does not effect the true right angle.


It is commonly used in Plumb Level, Surveying, Alignment, Range finding and Optical Tooling. The reflecting surfaces of this Prism must be coated with a metallic or dielectric coating. The standard Penta Prism reflecting surfaces are coated with aluminum with Black Paint.

Penta PrismFor custom applications, anti-reflection coatings are applied to the entrance & exit surfaces.BK7 Grade A optical glass
Diameter Sizen10mm To Maximumn
Thickness Tolerancen+0.0, -0.03mmn
Angle Of Incidence 45`
Surface Quality60-40 scratch and dig
Dimension+/-0.2 (General), +0/-0.05 (High Precision)n
Deviation Toleranceaccording to the table
Reflectivity R > 95% per face @400-700 nm
  • Other Diameter / Thickness Available on Request
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