Custom Meniscus Lens Positive and Negative Meniscus Lenses

Meniscus Lens can increase the NA of the system while only adding slightly to the total srical aberrations. The Negative Meniscus Lens is used to increase the focal length of another lens while maintaining the angular resolution of the optical assembly. This lens shape is best used when one conjugate is relatively far from the lens.Material: Optical GlassSurface Flatness: < λ/5 @ 633nmScratch/Dig: < 40/20 (both sides)Eccentricity: ≤ 1arcminFocal Length Tolerance < ± 1%Diameter Tolerance: < + 0.00/ - 0.10mmThickness Tolerance: < ± 0.1Clear Aperture: ≥ 90% of diameterCoating: AR OR BBARDiameter Range: 5~260mm