High-Precision Optical-Glass Pentaprisms
A pentaprism has a pentagonal cross section, two reflecting faces, usually silver- or aluminum-coated, and three transmitting faces. The angle between the entrance and exit faces is 90°, and that between the reflecting faces is 45°. This high-precision optical-glass prism deflects light through a constant 90° regardless of prism rotation or alignment errors. Its geometry provides precise beam steering for applications requiring absolute angular stability. Other sizes and coatings are available. In imaging systems, multiple reflections produce an upright viewfinder image for telescopes and photography. In measuring instruments, pentaprisms are used in total stations and laser rangefinders for industrial surveying, real-estate surveying and military ranging.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | N-BK7, Fused Silica or Other Optical Glass |
| Dimensional Tolerance | +0.0, -0.2mm |
| Surface Finish | 60-40 |
| Surface Figure [632.8nm] | λ/4 @ 632.8nm |
| Angle Tolerance | ±30 Arcseconds (Standard); ±5 Arcseconds (High Precision) |
| Clear Aperture Dimension | >85% of Dimension |
| Chamfer [45°] | <0.25mm×45° |
| Coating [S1 and S2] | Surfaces S1 and S2: Single-Layer MgF2 Coating |
| Coating [S3 and S4] | Surfaces S3 and S4: Aluminum-Coated and Blackened |
| Typical Dimensions A×h | 2.5×2.5；2.5×2.5；7.0×5.0；10.0×10.0；15.0×15.0；20.0×20.0 |
Applications
Datasheet
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Supplier Information
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