Penta Prism


Products Description:


Penta prism can deviate an incident beam without inverting or reversing to 90°.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. It is commonly used in Plumb Level, Surveying, Alignment, Range finding and Optical Tooling.

From prototype to production, Focus Technology designs, manufactures, and coats prism. Prism are one of the most basic optical components to produce. With complete in-house capabilities, Focus is able to offer Penta Prism at the lowest pricing with fast delivery times.

Technical Parameters


BK7 Grade A Optical Glass

Dimension (mm):

2.5x2.5 ~ 100x100

Dimension Tolerance (mm):

+/-0.2 (General), +/-0.05 (High Precision)

90° Deviation Tolerance:

1 arc min.(General),3 arc sec.(High Precision)

Angle Tolerance:

3 arc min. (General), 3 arc sec. (High Precision)

Surface Quality

80/50 (General), 10/5 (High Precision)

Flatness (per 25mm@633nm)

λ(General), λ/8 (High Precision)




(1). Apart from N-BK7 glass, other optical glass is available for custom-made Penta Prisms.
(2). Penta Prism at bigger size is available.
(3). Typical deviation tolerance is 1 minute, better precision such as 30 sec, 10 sec, 5 sec or 3 sec is available.
(4). Typical reflection is >90% by Al coating, other metal coating such as Ag, Cu, or High Reflection Dielectric Coating is available.
(5). Besides uncoating, Anti-Reflective(AR) coating is available upon request. 

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