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Penta Prisms

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  • Penta prisms can deviate an incident beam to 90° without inverting or reversing. The deviation angle of 90° is independent of any rotation of the prism about an axis parallel to the line of intersection of the two reflecting faces. Movement of the prism does not affect the right angle at which rays are reflected. The penta prism is the important part in Plumb Level and Rangefinding. It acts as a turning mirror which is insensitive to alignment and also it is a necessary optical tool.

 

Specifications

Material: Crown, Flint, UVFS
Surface Flatness: λ/4 @ 633nm
Surface quality: 40/20
Angle Tolerance: +0.00/-0.20mm
Beam Deviation: <10"
Clear Aperture: 90% of central dimension
Coating: Reflecting surface are aluminum coated with black paint overcoat. entrance and exit surfaces are uncoated or coated with a single layer MgF2
Bevel: 0.3mmx45°
  • ·Plumb Level Surveying Alignment
  • ·Rangefinding Optical Tooling