Deln optics makes a lot of optical lenses,The surface polishing quality and coating of these lenses are exnt.
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Specifications | |
| Material | N-BK7 (Grade A) |
| Tolerance | +0.00/-0.10 mm |
| Design Wavelength | 587.6 nm |
| Surface Quality | 40-20 Scratch-Dig |
| Plano Surface Flatness | λ/2 |
| Srical Surface Powerb | 3λ/2 |
| Centration | ≤3 arcmin |
| Clear Aperture | >90% of Diameter |
| Focal Length Tolerance | ±1% |
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