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Check out my other items Edmund Optics #45-438 (45438) 18.0mm Dia. x 18.0mm FLMgF2 CoatedPlano-Convex Lens $4.00 Shipping to US Locations for any Quantity Purchased!! TECHSPEC® MgF2 Coated Plano-Convex (PCX) Lenses have a positive focal length, making them ideal for collecting and focusing light in imaging applications. They are also useful in a variety of applications involving emitters, detectors, lasers, and fiber optics. Specifications: Diameter (mm):18.00 +0.0/-0.025Effective Focal Length EFL (mm):18.00 @ 587.6nmBack Focal Length BFL (mm):11.20Coating:MgF2 (400-700nm)Coating Specification:Ravg ≤1.75% @ 400 - 700nmSubstrate: N-BK7Surface Quality:40-20Power (P-V) @ 632.8nm:1.5λIrregularity (P-V) @ 632.8nm:λ/4Focal Length Tolerance (%):±1Centering (arcmin):<1Center Thickness CT (mm):10.33 ±0.10Edge Thickness ET (mm):3.47Radius R1 (mm):9.33Clear Aperture CA (mm):17f/#:1Numerical Aperture NA:0.50Type:Plano-Convex LensBevel:Protective bevel as neededWavelength Range (nm):400 - 700Damage Threshold, Reference: 10 J/cm2 @ 532nm, 10ns

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