Product type: Convex Lens. Application: Lighting, Medical, Optical, Photography, Astronomy. Model: Coated lens.
Overview
D23.20mm 490-570nm AR Coated Optical Doublet Achromatic Lenses is an optical lens made from Optical Glass. Listed geometry: diameter 21.20+0.00/-0.05mm, cemented shape. Optical / electrical data: transmittance 90%-95%. Coating: Anti-Reflection. 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
| Material | Optical Glass |
|---|---|
| Type | Convex Lens |
| Shape | Cemented |
| Diameter | 21.20+0.00/-0.05mm |
| Transmittance | 90%-95% |
| Coating | Anti-Reflection |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Model NO. | Coated lens |
| Lenses Color | Clear |
| Center thickness | 11.118+/-0.100mm |
| S3 SAG | 1.615+/-0.025mm |
| S4 SAG | 2.659+/-0.025mm |
| R1 | 16.949mm+/-0.1%,CX |
| R2=R3 | 35.585mm+/-0.05%,Doublet |
| R4 | 13.667mm+/-0.1%,CC |
| Centerness | <4arcmin |
| S3&S4 | ETV<0.02mm |
| S1&S2 | >D20.4mm |
| S3 | >D21.2mm |
| S4 | >D16.2mm |
| Chamfer | <0.2mm(FW)x45deg |
| AR coating,Ravg<0.5% and Tavg>99%@490-570nm,AOI | 0deg |
| Standard | MIL-PRF-13830B |
| Supplier | CPG OPTICS LIMITED |
Technical data
| Items | Description | |
| Doublet Lenses | Material: | Schott N-SK2 |
| Schott N-SF6HT | ||
| Diameter: | 21.20+0.00/-0.05mm | |
| 23.20+0.00/-0.05mm | ||
| Center thickness: | 11.118+/-0.100mm | |
| S3 SAG: | 1.615+/-0.025mm | |
| S4 SAG: | 2.659+/-0.025mm | |
| R1: | 16.949mm+/-0.1%,CX | |
| R2=R3: | 35.585mm+/-0.05%,Doublet | |
| R4: | 13.667mm+/-0.1%,CC | |
| Surface quality: | S1&S2&S3&S4:80-60 | |
| Centerness: | <4arcmin | |
| S3&S4:ETV<0.02mm | ||
| Clear aperture: | S1&S2:>D20.4mm | |
| S3:>D21.2mm | ||
| S4:>D16.2mm | ||
| Chamfer: | <0.2mm(FW)x45deg | |
| Standard: | MIL-PRF-13830B |
What to specify when you request a quote
- Material — listed as “Optical Glass”; name the glass or crystal.
- Geometry — listed as “21.20+0.00/-0.05mm”; give diameter, focal length or radii, angles and tolerances.
- Surface figure — quote surface figure (λ) and scratch-dig.
- Centring and edges — listed as “<0.2mm(FW)x45deg”; 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 AR-Coated Glass Materials for High-Transmission Optical Parts. How parts like this are machined and finished is covered in Optical Glass Polishing for High Clarity Surfaces. For an application example, read AR Coated Glass for Appliance Touch Screens: Specs and Selection. Before sending a drawing, check Fused Silica Refractive Index: Key to Optical Design Improvement. A related standard product is AR-Coated High-Transparency Optical Glass.
