N-BK7 SF11 Optical Glass Achromatic Doublet for High-Resolution
Photography
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 |
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