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Penta Prism

A pentaprism is a five-sided reflecting prism used to deviate a beam of light by 90°. The beam reflects inside the prism twice, allowing the transmission of an image through a right angle without inverting it.

The reflections inside the prism are not caused by total internal reflection, since the beams are incident at an angle less than the critical angle, or minimum angle for total internal reflection. Instead, the two faces are coated to provide mirror surfaces. The two opposite transmitting faces are often coated with an antireflection coating to reduce spurious reflections. The fifth face of the prism is not used optically.

Specification
Material	BK7 Grade A Optical Glass ^[1]
Dimension	see the table ^[2]
Dimension Tolerance	±0.25mm
Clear Aperture	>90%
90° Deviation Tolerance	see the table ^[3]
Flatness	λ/2@632.8nm
Surface Quality	60-40 scratch and dig
Reflectivity	R > 95% per face from 630 to 680 nm
Coating	Aluminum coated on reflecting surfaces with black paint
	Un-coated on entrance and exit surface ^[4]
Note
*[1]* Other Material (UV Fused Silica) is available upon request. *[2]* Other Dimension is available upon request. *[3]* Precision series (90 Deviation Tolerance < 2 arc sec) is made by adding a wedge. *[4]* AR coating on entrance and exit surface is available upon request.

Standard Products
Size(mm)	90° Deviation Tolerance
A × h	1 min.	30 sec.	10 sec.	5 sec.	2 sec.
7 × 6	PTP0101	PTP0201	PTP0301	PTP0401	PTP0501
8 × 8	PTP0102	PTP0202	PTP0302	PTP0402	PTP0502
10 × 10	PTP0103	PTP0203	PTP0303	PTP0403	PTP0503
12 × 12	PTP0104	PTP0204	PTP0304	PTP0404	PTP0504
15 × 15	PTP0105	PTP0205	PTP0305	PTP0405	PTP0505
20 × 20	PTP0106	PTP0206	PTP0306	PTP0406	PTP0506