# 1″ diameter or custome size quartz AR coated step lens

> 1" diameter or custome size quartz AR coated step lens — an optical lens: Schott N-BK7, Anti-Reflection. Specs, RFQ checklist and custom sizes to drawing.

- Page: https://machiningglass.com/products/1-diameter-or-custome-size-quartz-ar-coated-step-lens/
- SKU: MG-9663B3
- Category: Optical Lenses, Prisms & Mirrors > Precision Optical Lenses
- Image: https://machiningglass.com/wp-content/uploads/2026/10/1-diameter-or-custome-size-quartz-AR-coated-step-lens.webp
- Updated: 2026-10-24

Product type: Step lens. Application: Lighting, Medical, Optical, Photography, Astronomy.

## Overview

1" diameter or custome size quartz AR coated step lens is an optical lens made from Schott N-BK7. Listed geometry: diameter 25.40+0.05/-0.13mm or others, single-lens shape. Optical / electrical data: transmittance >95%. Coating: Anti-Reflection; surface quality 10/5; flatness 1/10 Lambda. Listed for Lighting, Medical, Optical, Photography and Astronomy applications. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Material | Schott N-BK7 |
| Type | Step lens |
| Shape | Single-lens |
| Diameter | 25.40+0.05/-0.13mm or others |
| Transmittance | >95% |
| Coating | Anti-Reflection |
| Surface quality | 10/5 |
| Parallelism | <3" |
| Clear aperture | >90% |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Lenses Color | Clear |
| Materials | Schtt BK7/Fused Silica/Quartz |
| Step thickness | custome |
| RMS | 4A/1A |
| Surface flatness | 1/10 Lambda |
| Coatings | Upon request |
| Concentricity | <0.05mm |
| Center thickness | 11.7+/-0.1mm or others |
| ROC1 | Infinity |
| ROC2 | 13.1mm+/-3%,CX |
| Centerness | <3arcmin |
| Chamfer | 0.1-0.3mm(LW)x45deg |
| Standard | MIL-PRF-13830B |
| CPG is also an ISO | 9001&14001 certified manufacture, we deliver fast and provide best cost performance ratio for our customers. |
| Package detail | Optics are packed with Capacitor paper, white paper, custom-made plastic containers etc |
| Supplier | CPG OPTICS LIMITED |

## Technical data

|   |   |   |
| --- | --- | --- |
| Items | Description |  |
| Plano-Convex Lenses | Material: | Schott N-BK7/Fused Silica/Quartz |
| Diameter: | 25.40+0.05/-0.13mm or others |  |
| Center thickness: | 11.7+/-0.1mm or others |  |
| ROC1: | Infinity |  |
| ROC2: | 13.1mm+/-3%,CX |  |
| Surface quality: | S1&S2:S-D 10-5 |  |
| Centerness: | <3arcmin |  |
| Clear aperture: | >90% |  |
| Chamfer: | 0.1-0.3mm(LW)x45deg |  |
| Coating: | AR coated |  |
| Standard: | MIL-PRF-13830B |  |

## What to specify when you request a quote

- **Material** — listed as “Schott N-BK7”; name the glass or crystal.
- **Geometry** — listed as “25.40+0.05/-0.13mm or others”; give diameter, focal length or radii, angles and tolerances.
- **Surface figure** — listed as “10/5”; quote surface figure (λ) and scratch-dig.
- **Centring and edges** — listed as “<0.05mm”; state centration and edge chamfer.
- **Coating** — listed as “Anti-Reflection”; list the band and reflectance or transmission target.

## Engineering guides for this part

For material grades and coating options, see [Selecting Fused Silica and Quartz Glass for Precision Components](https://machiningglass.com/materials/selecting-fused-silica-and-quartz-glass-for-precision-components/). 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/). For an application example, read [AR Coated Glass for Appliance Touch Screens: Specs and Selection](https://machiningglass.com/applications/ar-coated-glass-for-appliance-touch-screens-specs-and-selection/). Before sending a drawing, check [Quartz Glass Manufacturing: Controlling Thermal Conductivity in Fused Silica](https://machiningglass.com/resources/quartz-glass-manufacturing-controlling-thermal-conductivity-in-fused-silica/). A related standard product is [AR-Coated High-Transparency Optical Glass](https://machiningglass.com/products/ar-coated-high-transparency-optical-glass/).

## FAQ

### What is the 1" diameter or custome size quartz AR coated step lens made of?

It is listed as Schott N-BK7. Coating: Anti-Reflection. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.

### What sizes and thicknesses are available?

The listing gives diameter 25.40+0.05/-0.13mm or others. Custom outlines and thicknesses are made to drawing; state the tolerance you need.

### What optical or electrical performance does it have?

Listed values: transmittance >95%. Confirm the values at your operating wavelength, angle and temperature when you request a quote.

### Where is this optical lens used?

Listed applications: Lighting, Medical, Optical, Photography and Astronomy.

### 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=15005#mg-rfq

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