76.6mm Dia x 849.9mm FL Achromatic Lens

Product Details Offered in Cemented or Air-Spaced Designs Mounted Versions Available for Easy Integration Feature MgF 2 Anti-Reflection Coating TECHSPEC Large Precision Achromatic Lenses offer near-diffraction limited performance across the designated wavelength range. These color-corrected achromatic lenses feature long focal lengths and are available in either cemented or air-spaced designs. The lenses have a MgF2 anti-reflection coating and are available in diameters up to 140mm. TECHSPEC Large Precision Achromatic Lenses, in the mounted version, feature a male mounting thread for easy integration into optical systems. Adhesive foil spacers and mounting instructions are included for unmounted, air-spaced achromatic lenses. Specifications General Type: Achromatic Lens Physical & Mechanical Properties Diameter (mm): 76.56 +0.00/-0.08 Center Thickness CT 1 (mm): 13.08 Center Thickness CT 2 (mm): 10.16 Edge Thickness ET (mm): 21.27 Clear Aperture CA (mm): 73.25 Centering (arcmin): 5.00 Construction: Unmounted, Airspaced 0.10mm Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): 849.96 Focal Length Tolerance (%): ±1 Focal Length Specification Wavelength (nm): 587.6 Back Focal Length BFL (mm): 838.69 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More N-BK7 / N-SF2 f/#: 11.1 Numerical Aperture NA: 0.05 Coating: MgF 2 (400-700nm) Coating Specification: R avg ≤1.75% @ 400 – 700nm Wavelength Range (nm): 400 – 700 Radius R 1 (mm): 497.21 Radius R 2 (mm): -345.82 Radius R 3 (mm): -344.20 Radius R 4 (mm): -1227.86 Surface Quality: 60-40 Regulatory Compliance Certificate of Conformance: View × Reach 240: Compliant ×