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

Categories Achromatic Lens
Brand Name: LONGWAY
Model Number: LW16092042
Certification: ISO9001
Place of Origin: Shanghai, China
MOQ: 300 pieces
Price: NEGOTIATION
Payment Terms: D/P,T/T,Western Union
Supply Ability: 50000 Pieces per Month
Packaging Details: electrolytic capacitor paper,foam,carton
Shape: Achromatic Convex Concave
Surface quality: 40/20
Transmission: over 90%
Coating: available
Application: Optics and Laser
OEM: available
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N-BK7 SF11 Optical Glass Achromatic Doublet for High-Resolution Photography



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


  1. 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.


NameOptical Achromatic Doublet
MaterialOptical glass, Qurartz glass, borosilicate glass
Diameter Tolerance+0/-0.15 mm
Thickness Tolerance+/-0.15mm
Processedby grinding, polishing
Surface Quality60/40,40/20
Material Qualityno scratches and air bubble
Transmissionabove 90%
Chamfer0.1-0.5 mm x 45°
Surface CoatingAvailable
UsagePhotography, Lighting system






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