Product type: Concave Lens. Application: Lighting, Medical, Optical, Photography, Astronomy.
Overview
Dia78xct4mm 400-700nm VIS Coated Optical Biconcave Lenses: an optical lens made from Optical Glass. Listed geometry: diameter 78.0+/-0.1mm, single-lens shape. Optical / electrical data: transmittance 90%-95%. Coating: HMC; surface quality 40-20. Typical applications: Lighting, Medical, Optical, Photography and Astronomy. 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 | Concave Lens |
| Shape | Single-lens |
| Diameter | 78.0+/-0.1mm |
| Transmittance | 90%-95% |
| Coating | HMC |
| Surface quality | 40-20 |
| Clear Aperture | >90% |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Lenses Color | Clear |
| Specifications | Items |
| Center thickness | 4.0+/-0.1mm |
| ROC1 | 189.881mm,CC |
| ROC2 | 109.201mm,CC |
| Centerness | <3arcmin |
| Chamfer | protected |
| AR coating,Rabs<0.5%@425-675nm,AOI | 0deg |
| Standard | MIL-PRF-13830B |
| Supplier | CPG OPTICS LIMITED |
Technical data
| Items | Description | |
| Biconcave Lens | Material: | Schott N-SF57 |
| Diameter: | 78.0+/-0.1mm | |
| Center thickness: | 4.0+/-0.1mm | |
| ROC1: | 189.881mm,CC | |
| ROC2: | 109.201mm,CC | |
| Surface quality: | 40-20 | |
| Centerness: | <3arcmin | |
| Clear Aperture: | >90% | |
| Chamfer: | protected | |
| 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 “78.0+/-0.1mm”; give diameter, focal length or radii, angles and tolerances.
- Surface figure — listed as “40-20”; quote surface figure (λ) and scratch-dig.
- Centring and edges — listed as “protected”; state centration and edge chamfer.
- Coating — listed as “HMC”; list the band and reflectance or transmission target.
Engineering guides for this part
For material grades and coating options, see Fused Silica Wafer Material Selection for Precision Glass Processing. How parts like this are machined and finished is covered in Flat Glass Polishing Process for Precision Substrates. For an application example, read Fused Silica Glass Wafers for Precision Appliance Electronics. Before sending a drawing, check Fused Silica Refractive Index: Key to Optical Design Improvement. A related standard product is Fused Silica Glass Wafers (2–12", JGS1/JGS2).
