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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.
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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.


Penta prism specification or based on clients' requirements

1.Material

N-BK7,FS or based on clients' requirements

2.Dimensional tolerances

0/-0.1mm

3.Surface flatness

人/4@633nm

4.Clear aperture

90%

5.Beam Deviation

<10"

6.Surface Quality

US Military Standard 40-20，ISO Standard 3X0.16

7.Edge Chip

＜0.1mm

8.Bevel

<0.3mmx45°

9.Coating

Reflective surface is coated with aluminum and protected with black paint, and refractive surface is coated with a single layer of MgF2 or Based on client requests