Product Description

l AR Coating: 350-700 nm or 650-1050 nm

l Superior Image Quality Compared to Singlets

l Clear Aperture: Ø20 mm

l 1" Outer Diameter, Compatible with Ø1" Lens Tubes

     Tuniu Air-Spaced Achromatic Doublets deliver a spot size close to the diffraction limit, with optical designs that correct for most aberrations. Compared to cemented doublets, they offer a higher damage threshold. These doublets are designed for broad wavelength ranges. For different coating options, Tuniu uses three typical wavelengths in the lens design: For 350–700 nm AR coating: 486.1 nm, 587.6 nm, and 656.3 nm；For 650–1050 nm AR coating: 706.5 nm, 855 nm, and 1015 nm. All Tuniu lenses are precision-manufactured under strict quality control, ensuring high-quality optical products at competitive prices.

Air-Spaced Achromatic Doublet, AR Coating: 350-700 nm

     Tuniu Air-Spaced Achromatic Doublets are designed to correct spherical and chromatic aberrations, achieving a spot size close to the diffraction limit. The visible-light air-spaced achromatic doublets are coated with a 350-700 nm anti-reflection (AR) coating. Below 400 nm, the material transmittance gradually decreases to zero; refer to the theoretical transmittance data on the curve page for details. Each lens mount is engraved with the product model number, AR coating wavelength, focal length, and the direction of light propagation for collimation.

Air-Spaced Achromatic Doublet, AR Coating: 650-1050 nm·

     Tuniu Air-Spaced Achromatic Doublets are designed to correct spherical and chromatic aberrations, delivering a spot size close to the diffraction limit. The near-infrared air-spaced achromatic doublets are coated with a 650-1050 nm anti-reflection (AR) coating. With two additional degrees of freedom compared to cemented doublets, these lenses can outperform cemented designs in certain applications. Each lens mount is engraved with the product model number, AR coating wavelength, focal length, and the direction of light propagation for collimation.