75mm Dia. x 400mm FL, VIS-NIR Coated, Achromatic Lens

Product Details Designed for 0° Angle of Incidence Less Than 0.25% Reflectance Per Surface @ 880nm MgF 2 and VIS 0° Coated Achromats Also Available TECHSPEC VIS-NIR Coated Achromatic Lenses consist of two optical components cemented together to form an achromatic doublet. The doublet is computer optimized to correct for on-axis spherical and chromatic aberrations. TECHSPEC VIS-NIR Coated Achromatic Lenses have visible/near-infrared broadband anti-reflection coating, which is specially optimized to yield maximum transmission (>99%) in the near-infrared. The achromatic lenses reduce reflection to less than 0.25 percent per surface at 880nm. Magnesium Fluoride coated and VIS 0° coated achromats are also available. Specifications General Type: Achromatic Lens Physical & Mechanical Properties Diameter (mm): 75.00 +0.0/-0.025 Center Thickness CT (mm): 17.05 ±0.20 Center Thickness CT 1 (mm): 11.05 ±0.10 Center Thickness CT 2 (mm): 6.00 ±0.10 Edge Thickness ET (mm): 12.84 Clear Aperture CA (mm): 73.5 Centering (arcmin): <1 Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): 400.00 Focal Length Tolerance (%): ±1 Focal Length Specification Wavelength (nm): 587.6 Back Focal Length BFL (mm): 392.1 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More N-BK7 / N-SF5 f/#: 5.3 Numerical Aperture NA: 0.09 Coating: VIS-NIR (400-1000nm) Coating Specification: R abs ≤0.25% @ 880nm R avg ≤1.25% @ 400 - 870nm R avg ≤1.25% @ 890 - 1000nm Wavelength Range (nm): 400 - 1000 Radius R 1 (mm): 246.50 Radius R 2 (mm): -180.92 Radius R 3 (mm): -526.7 Surface Quality: 40-20 Power (P-V) @ 632.8nm: 1.5λ Irregularity (P-V) @ 632.8nm: λ/4 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × REACH 241: Compliant ×