40mm Dia x -80mm FL Negative Doublet Lens MgF 2 Coated

Product Details Magnesium Fluoride (MgF 2 ) Coating Used to Extend Focal Length Broadband AR Coated Negative Achromatic Lenses Also Available TECHSPEC MgF 2 Coated Negative Achromatic Lenses consist of two optical elements cemented together. Negative doublet lenses are corrected for color and on-axis aberrations. TECHSPEC MgF 2 Coated Negative Achromatic Lenses are used predominantly as Barlow lenses to extend focal lengths. These lenses are often combined with positive achromatic mirror systems and imaging lenses. Specifications General Type: Negative Achromatic Lens Physical & Mechanical Properties Diameter (mm): 40.00 +0.0/-0.025 Center Thickness CT (mm): 10.50 ±0.20 Center Thickness CT 1 (mm): 4.00 ±0.10 Center Thickness CT 2 (mm): 6.50 ±0.10 Edge Thickness ET (mm): 16.26 Clear Aperture CA (mm): 39.00 Centering (arcmin): <1 Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): -80.00 Focal Length Tolerance (%): ±1 Focal Length Specification Wavelength (nm): 587.6 Back Focal Length BFL (mm): -84.47 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More N-BK7 / N-SF5 f/#: 2.00 Numerical Aperture NA: 0.25 Coating: MgF 2 (400-700nm) Coating Specification: R avg ≤1.75% @ 400 - 700nm Wavelength Range (nm): 400 - 700 Radius R 1 (mm): -47.32 Radius R 2 (mm): 40.51 Radius R 3 (mm): 128.26 Surface Quality: 40-20 Power (P-V) @ 632.8nm: 1.5λ Irregularity (P-V) @ 632.8nm: λ/4 Regulatory Compliance RoHS 2015: Compliant × Reach 219: Compliant × Certificate of Conformance: View ×