A roof prism is a reflective optical prism containing a section where two faces meet at a 90° angle. Reflection from the two 90° faces returns an image that is flipped laterally across the axis where the faces meet.
Roof Prism
A roof prism is a reflective optical prism containing a section where two faces meet at a 90° angle.
Reflection from the two 90° faces returns an image that is flipped laterally across the axis where the faces meet.
Ideal for use in spotting scopes, and any optical instrument where it is desirable to take an inverted image from an objective, turn it right side up, and bend it through a 90° angle in order to maintain the correct visual orientation.
Roof Prism Half and Penta Prism are the most popular products in A-Star as volume producing.
| 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 |
High Precision Beamsplitter Penta Prism Standard Series:
| Size(mm) | 10Sec. Deviation | 10Sec. Deviation |
| A x h | Part No. | Part No. |
| 2.5 x2.5 | APP1401 | APP1501 |
| 7×5 | APP1402 | APP1502 |
| 7 x 6 | APP1403 | APP1503 |
| 10 x 10 | APP1404 | APP1504 |
| 15 x 15 | APP1405 | APP1505 |
| 20 x 20 | APP1406 | APP1506 |
Note: A-Star supply Beamsplitter Penta Prism with standard Trasmission/Reflection(T/R) ratio of 20/80,50/50. Other T/R ratio is available open request.
Optical Penta Prism Beamsplitter
50% Reflection / 50% Transmission
Beam Deviation Insensitive to Alignment
Designed for Visible Wavelengths
Penta Prism Beamsplitters are constructed by cementing a precision penta prism and a wedge prism together, and applying an appropriate interference coating to one of the traditionally reflective surfaces. Since slight movements of a penta prism do not affect the true right angle at which light rays are reflected, the deviation between the transmitted and reflected light rays is highly controllable and will not vary by more than 10arcsec.
We are a professional customized manufactory of hig-end medical optical instruments and high precision optical components in China. Most of our products won the national patent.
Product Name: Beamsplitter Penta Prism
Material: BK7 or other optical glass
The deviation angle of 90° 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 geometry that total internal reflection cannot be used, the reflecting surfaces must be coated with a metallic or dielectric coating. The standard Penta Prism reflecting surfaces are coated with aluminum or enhanced aluminum. Sometimes, the coated surfaces are with black painting.