N-BK7 SF11 Optical Glass Achromatic Doublet for High-Resolution Photography
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Material
- Composition: The N-BK7/SF11 Achromatic Doublet is composed of two types of optical glass: N-BK7 and SF11.
- N-BK7: A type of borosilicate crown glass with high transmittance in the visible and near-infrared spectrum.
- SF11: A type of flint glass known for its ability to correct chromatic aberrations in combination with crown glass.
Property
- Refractive Index: Each glass type has a distinct refractive index, which allows for the dispersion of light to be managed and corrected.
- N-BK7: Typically has a refractive index of around 1.516 at 587.6 nm.
- SF11: Typically has a higher refractive index compared to N-BK7, aiding in the correction of chromatic aberrations.
- Dispersion: The combination of N-BK7 and SF11 glasses is specifically chosen to minimize dispersion, ensuring that light of different colors focuses to a common point.
- Durability: Both glasses are resistant to thermal shock and chemical attack, ensuring longevity and stability in various environments.
Function
- Achromatic Correction: The doublet design utilizes the different refractive indices and dispersions of N-BK7 and SF11 glasses to correct for chromatic aberrations. This results in images that are free from color fringes and have high color fidelity.
- High Resolution: The precise manufacturing and optical properties of the doublet enable it to produce high-resolution images with sharp detail and clarity.
- Focal Length and Aperture: The doublet can be designed with various focal lengths and apertures to suit different photographic needs, from wide-angle to telephoto applications.
Application
- High-Resolution Photography: Ideal for use in professional photography where high resolution and color accuracy are critical, such as portrait photography, landscape photography, and scientific imaging.
- Telescopes and Binoculars: The achromatic doublet can be used in telescopes and binoculars to produce clear, high-contrast images with minimal chromatic aberration.
- Machine Vision and Imaging Systems: Suitable for machine vision and imaging systems that require precise color rendition and high spatial resolution.
| Name | Optical Achromatic Doublet |
| Material | Optical glass, Qurartz glass, borosilicate glass |
| Diameter Tolerance | +0/-0.15 mm |
| Thickness Tolerance | +/-0.15mm |
| Processed | by grinding, polishing |
| Surface Quality | 60/40,40/20 |
| Material Quality | no scratches and air bubble |
| Transmission | above 90% |
| Chamfer | 0.1-0.5 mm x 45° |
| Surface Coating | Available |
| Usage | Photography, Lighting system |
