# Premium Bk7 Optical Glass 20mm Aspherical Magnifying Lens

> Premium Bk7 Optical Glass 20mm Aspherical Magnifying Lens — an optical lens: Optical Glass, Custom as Per Demand. Specs, RFQ checklist and custom sizes to…

- Page: https://machiningglass.com/products/premium-bk7-optical-glass-20mm-aspherical-magnifying-lens/
- SKU: MG-F7D009
- Category: Optical Lenses, Prisms & Mirrors > Precision Optical Lenses
- Image: https://machiningglass.com/wp-content/uploads/2026/10/Premium-Bk7-Optical-Glass-20mm-Aspherical-Magnifying-Lens.webp
- Updated: 2026-10-24

Product type: Flat Lens. Application: Lighting, Medical, Optical, Photography, Laser, Astronomy, Imaging, Detection, etc. Model: OL-0162.

## Overview

The Premium Bk7 Optical Glass 20mm Aspherical Magnifying Lens is supplied as an optical lens in Optical Glass (Bk7, Quartz, Infrared, Sapphire, Ge, Si, Znse, Caf substrate). Listed geometry: diameter 1.5-300mm, size Custom, single-lens shape. Optical / electrical data: transmittance >95%. Coating: Custom as Per Demand. It is used in Lighting, Medical, Optical, Photography and Laser. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Material | Optical Glass |
| Substrate | Bk7, Quartz, Infrared, Sapphire, Ge, Si, Znse, Caf |
| Type | Flat Lens |
| Shape | Single-lens |
| Diameter | 1.5-300mm |
| Size | Custom |
| Transmittance | >95% |
| Coating | Custom as Per Demand |
| Usage | Lighting, Medical, Optical, Photography, Laser, Astronomy, Imaging, Detection, etc |
| Model NO. | OL-0162 |
| Lenses Color | Clear |
| Product Name | Optical Lens |
| What we offer | 1) Good quality control |
| Supplier | C-Laser (Taicang) Material Technology Co., Ltd. |

## Technical data

| Parameter | Value |
| --- | --- |
| Material | N-BK7, UV grade fused silica, JGS1, LasfN9, N-SF11, Sapphite, silicon, and other IR glasses |
| Diameter range | From 1.5mm to 800mm |
| Tolerance | 0.02mm |
| Thickness tolerance | 0.02mm |
| Surface quality | 40/20 |
| Irregularity | Lambda/4 or Lambda/2 |
| Chamfer | Preotective chamfer |
| Coating | Uncoated or AR coated for visible or UV or infrared wavelength, R<0.5% |

## What to specify when you request a quote

- **Material** — listed as “Optical Glass”; name the glass or crystal.
- **Geometry** — listed as “1.5-300mm”; give diameter, focal length or radii, angles and tolerances.
- **Surface figure** — quote surface figure (λ) and scratch-dig.
- **Centring and edges** — state centration and edge chamfer.
- **Coating** — listed as “Custom as Per Demand”; list the band and reflectance or transmission target.

## Engineering guides for this part

For material grades and coating options, see [Fused Silica Windows for UV and Laser Optical Systems](https://machiningglass.com/materials/fused-silica-windows-for-uv-and-laser-optical-systems/). 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 [How to Handle and Maintain Precision Glass Components in Laser Systems](https://machiningglass.com/applications/how-to-handle-and-maintain-precision-glass-components-in-laser-systems/). 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 [Infrared Windows](https://machiningglass.com/products/infrared-windows/).

## FAQ

### What is the Premium Bk7 Optical Glass 20mm Aspherical Magnifying Lens made of?

It is listed as Optical Glass with a Bk7, Quartz, Infrared, Sapphire, Ge, Si, Znse, Caf substrate. Coating: Custom as Per Demand. 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 1.5-300mm, size Custom. 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, Laser, Astronomy, Imaging and Detection.

### 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=14659#mg-rfq

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