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.