Penta prism can deviate an incident beam without inverting or reversing to 90 degree. The deviation angle of 90 degree is independent of any rotation of the prism about an axis parallel to the line of intersection of the two reflecting faces. It is commonly used in Plumb Level, Surveying, Alignment, Rangefinding and Optical Tooling.
Penta Prism is a five-sided prism containing two reflecting surfaces at 45 degree to each other, and two refracting faces perpendicular to the enterring and emerging beams. The important properties of Penta Prism are:
1. The image is neither inverted nor reversed, just deviated by 90 degree.
2.With the prism, a constant deviation angle applies to all rays transmitted by the useful aperture, regardless of the angles between these rays and the optical axis (or entrance and exit face normal).
The deviation angle of 90 degree is thus independent of the orientation of the prism, making it especially important in applications in which the prism orientation cannot be precisely controlled. Due to the geometry tric coating. The standard Penta Prism reflecting surfaces are coated with aluminum or enhanced aluminum. The coated surfaces can be painted black.
BK7 Grade A optical glass
90 Degree Deviation Tolerance
<30 arc seconds
1/2 wave @ 632.8nm
R>95% per face from 630 to 680 nm
60-40 scratch and dig
China Optics Net
A x H(mm)
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