Product Description

l Optical Material: N-SF11

l Operating Wavelength: 400 nm-700 nm (AR Coating)

l Application: Imaging, Beam Expansion or Reduction

     Tuniu Double-Concave Lenses feature two concave surfaces with equal radii of curvature, providing a negative focal length. They are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. To meet different application requirements, Tuniu offers double-concave lenses made from both N-SF11 and N-BK7 glass. N-SF11 lenses, with a lower Abbe number, exhibit higher dispersion than N-BK7, making them ideal for shorter focal length designs and for use in harsh environments such as acidic or alkaline conditions. N-BK7 lenses, by contrast, are among the most widely used materials for high-quality optics, offering excellent transmission in the visible and near-infrared regions and making them suitable for a broad range of general-purpose applications. Tuniu provides both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are manufactured with precision and undergo strict quality control, ensuring that Tuniu delivers high-performance optical components at competitive prices.

Attributes

Double-concave lens, N-SF11, AR coating: 400 nm-700 nm

     Tuniu biconcave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, Tuniu chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from Tuniu come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length on the housing for easy identification.

Double-concave lens, N-SF11, AR coating: 400 nm-700 nm, unmounted

     The Tuniu biconcave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, Tuniu chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from Tuniu can be mounted in Tuniu standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can select the optimal mounting method based on different application scenarios.