Penta Prism is a five-sided prism containing two reflecting surfaces at 45° to each other, and two refracting faces perpendicular to the entering and emerging beams.
Penta Prism
Penta Prism is a five-sided prism containing two reflecting surfaces at 45° to each other, and two refracting faces perpendicular to the entering and emerging beams. The standard Penta Prism reflecting surfaces are coated with aluminum or enhanced aluminum.
Specifications:
| Attribute | Specification(General) | Specification(High Precision) |
| Material: | BK7 Grade A Optical Glass | N-BK7 Grade A optical glass |
| Dimension: | 2.5×2.5~100.0×100.0 | 2.5×2.5~100.0×100.0 |
| Dimension Tolerance: | ±0.2 | ±0.05 mm |
| 90° Deviation Tolerance: | ＜1 arc min. | ＜3 arc sec. |
| Flatness: | λ/2@633nm | λ/4@633nm |
| Reflection: | R＞90%@400-700nm | R>95%per face @400-700nm |
| Angle Tolerance: | ＜3 arc min. | ＜3 arc sec. |
| Surface Quality: | 60/40 Scratch/Dig | 10/5 Scratch/Dig |
| Coating on input and output sides | Uncoated,AR Coated,etc | Uncoated,AR Coated,etc |
Penta Prism Standard Series:
| Size(mm) | 1 Min. Deviation | 30Sec. Deviation | 10Sec. Deviation |
| A x h | Part No. | Part No. | Part No. |
| 2.5 x2.5 | APP1101 | APP1201 | APP1301 |
| 7×5 | APP1102 | APP1202 | APP1302 |
| 7 x 6 | APP1103 | APP1203 | APP1303 |
| 10 x 10 | APP1104 | APP1204 | APP1304 |
| 15 x 15 | APP1105 | APP1205 | APP1305 |
| 20 x 20 | APP1106 | APP1206 | APP1306 |
Note:
1. Please contact us for the prices.
2. Custom-made non-standard Penta Prisms at any size are available upon request.
3. Besides N-Bk7, non-stand Penta Prisms made of other optical materials are availbale upon request.
4. Custom-made Penta Prisms with better flatness (<l/4@633nm), or better surface Quality(Better
than 40/20,or 20/10) are available up on request.
5. AR coating on the input/output surfaces are available. Please refer to page 30 for coating.
Penta prism
Penta Prism is a five-sided prism containing two reflecting surfaces at 45° to each other, and two refracting faces perpendicular to the entering and emerging beams.
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. The reflecting surfaces of this Prism must be coated with a metallic or dielectric coating. The standard Penta Prism reflecting surfaces are coated with aluminum or enhanced aluminum.
| Standard Precision Penta Prism Material:————————- N-BK7 Grade A optical glass |  Penta Prism |
| Size(mm) | 1 Min. eviation | 30 Sec.Deviation | 10 ec.Deviation |
| A x h | Part No. | Part No. | Part No. |
| 2.5 x 2.5 | FPP1101 | FPP1201 | FPP1301 |
| 7×5 | FPP1102 | FPP1202 | FPP1303 |
| 7 x 6 | FPP1103 | FPP1203 | FPP1304 |
| 10 x 10 | FPP1104 | FPP1204 | FPP1305 |
| 15 x 15 | FPP1105 | FPP1205 | FPP1306 |
| 20 x 20 | FPP1106 | FPP1206 | FPP1307 |
| High Precision Penta Prism By adding a wedge for deviation correction in output beam surface, it can be used as Percision Penta Prism. It is often used in Plumb Level, Surveying, Alignment, Rangefinding and Optical Tooling. Material: ——————————————————- N-BK7 Grade A optical glass |  Penta Prism |
Size(mm) | 1 Min. Deviation | 10 Sec.Deviation |
| A x h | Part No. | Part No. |
| 7×5 | FPP1402 | FPP1502 |
| 7×6 | FPP1403 | FPP1503 |
| 10 x 10 | FPP1404 | FPP1504 |
15 x 15 | FPP1405 | FPP1505 |
20 x 20 | FPP1406 | FPP1506 |
Note:
1. Please contact us for the prices.
2. Custom-made non-standard Penta Prisms at any size are available upon request.
3. Besides N-Bk7, non-stand Penta Prisms made of other optical materials are availbale upon request.
4. Custom-made Penta Prisms with better flatness (<l/4@633nm), or better surface Quality(Better
than 40/20,or 20/10) are available up on request.
5. AR coating on the input/output surfaces are available. Please refer to page 30 for coating.
Half -penta prisms are used to deviate the line of sight by 45 degree without inverting or reverting the image. The reflecting surface is aluminized and over-coated with Inconel and black paint to increase efficiency. Combining a Astar Half Penta Prism with a corresponding size Astar Schmidt Prism creates a Pechan prism pair. The Pechan prism pair will invert or revert the image while not deviating the line of sight. It can be used with converging or diverging light for system size reduction.
Half Penta prism is exactly a half cut from penta prism, it is widely used in telescope to deviate the line of sight by 45° without inverting or reverting the image. Shanghai Optics provides high quality prisms to meet your application. Contact us if you are interested.