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Positive Achromatic Lense

Positive Achromatic Lense

Regular price $50.00 USD
Regular price Sale price $50.00 USD
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Common Specifications:

Diameter Error:+0.0/-0.1mm
Center Thickness Error: ±0.2mm
Irregularity: λ/4@632.8nm
Effective Focal Length Error: ±2%
Lens Centering Error: 3-5”
Surface Quality: 40-20~60-40
Bevel: 0.2mmX45°

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What is Achromatic Lense

An achromatic lens is a lens that is designed to limit the effects of chromatic and spherical aberration. Chromatic aberration is the phenomenon where different wavelengths of light have different focal lengths, resulting in a blurred image with color fringes. Spherical aberration is the phenomenon where light rays that pass through the edge of a lens do not converge at the same point as the rays that pass through the center, resulting in a distorted image. An achromatic lens corrects these aberrations by combining two or more lens elements made of different types of glass with different amounts of dispersion. An achromatic lens can bring two wavelengths (typically red and blue) into focus on the same plane, and reduce the focus error for wavelengths in between. An achromatic lens can also improve the off-axis performance of a lens system by reducing coma and astigmatism. An achromatic lens is commonly used in applications such as fluorescence microscopy, image relay, inspection, spectroscopy, and telescopes.

Major specifications of Achromatic Lense

  • Focal length: The distance from the optical center of the lens to the image plane when the lens is focused at infinity. The focal length of an achromatic lens is constant for two wavelengths and varies slightly for other wavelengths.
  • Diameter: The size of the circular aperture that defines the maximum amount of light that can pass through the lens.
  • Center thickness: The thickness of the lens at its optical center.
  • Edge thickness: The thickness of the lens at its edge.
  • Radius of curvature: The radius of the spherical surface that forms one side of a lens element.
  • Effective focal length: The focal length of a lens system that consists of multiple elements. The effective focal length is equal to the focal length of a single lens that would produce the same image size and magnification as the lens system.
  • Back focal length: The distance from the last surface of the lens system to the image plane when the lens is focused at infinity.
  • Abbe number: A measure of the dispersion or color spreading of a glass material. A higher Abbe number means lower dispersion and better color correction.

Why Achromatic Lense is needed?

An achromatic lens is needed to improve the image quality and resolution of a lens system that operates with broadband or polychromatic light sources. By correcting chromatic and spherical aberration, an achromatic lens can produce sharper and clearer images with less distortion and color fringing. An achromatic lens can also enhance the contrast and brightness of an image by reducing stray light and glare. An achromatic lens can be used to achieve better performance than a comparable singlet lens with a simpler design and lower cost.

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