# Glass Roof Prism for Binoculars, Roof Prism Porro

> Glass Roof Prism for Binoculars, Roof Prism Porro — an optical prism: Glass. Specs, RFQ checklist and custom sizes to drawing.

- Page: https://machiningglass.com/products/glass-roof-prism-for-binoculars-roof-prism-porro/
- SKU: MG-36B9E5
- Category: Optical Lenses, Prisms & Mirrors > Optical Prisms
- Image: https://machiningglass.com/wp-content/uploads/2026/10/Glass-Roof-Prism-for-Binoculars-Roof-Prism-Porro.webp
- Updated: 2026-10-24

Product type: Prism. Application: Digital Device. Model: SRY40.

## Overview

The Glass Roof Prism for Binoculars, Roof Prism Porro is supplied as an optical prism made from Glass. Listed geometry: right angle shape. Surface quality 20-10; flatness 1/10 Lambda. It is used in Digital Device. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Material | Glass |
| Type | Prism |
| Shape | Right Angle |
| Surface Quality | 20-10 |
| Flatness | 1/10 Lambda |
| Application | Digital Device |
| Usage | Binocular Telescope |
| Model NO. | SRY40 |
| Tolereance | +0.00/-0.002mm |
| Angle Tol | <0.2 Seonds |
| Supplier | Changchun Sunday Optics Co., Ltd. |

## Technical data

| Parameter | Value |
| --- | --- |
| Material | BK7 K9 CaF2 Quartz Germanium Silicon ZnSe. |
| Size | 3-300mm |
| Tolerance | +/-0.01mm |
| Suface Quality | 10-5 |
| Angle tolerance | <3 seconds |
| Coating | AR,HR,Aluminum,Silver or customer request |

## What to specify when you request a quote

- **Material** — listed as “Glass”; name the glass or crystal.
- **Geometry** — listed as “<0.2 Seonds”; give diameter, focal length or radii, angles and tolerances.
- **Surface figure** — listed as “20-10”; quote surface figure (λ) and scratch-dig.
- **Centring and edges** — state centration and edge chamfer.
- **Coating** — list the band and reflectance or transmission target.

## Engineering guides for this part

How parts like this are machined and finished is covered in [Optical Glass Polishing for High Clarity Surfaces](https://machiningglass.com/capabilities/optical-glass-polishing-for-high-clarity-surfaces/). Before sending a drawing, check [Design Guide for Holes, Slots, and Edges in Custom Glass Parts](https://machiningglass.com/resources/design-guide-for-holes-slots-and-edges-in-custom-glass-parts/).

## FAQ

### What is the Glass Roof Prism for Binoculars, Roof Prism Porro made of?

It is listed as Glass. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.

### Where is this optical prism used?

Listed applications: Digital Device.

### What should I include in a quote request?

Include material, geometry, surface figure, centring and edges and coating, plus quantity and a drawing if the part is custom.

## Request a quote

Send drawings, tolerances and quantity: https://machiningglass.com/contact/?rfq_product_id=17171#mg-rfq

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Source: Custom Precision Glass Machining — https://machiningglass.com/