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LuoYang HengRen Optoelectronics Co.,Ltd make lenses with diameter from 1.0mm to 300mm by optical glass or optical crystals, such as BK7, fused silica, sapphire, and CaF2. Our standard lens has the following specifications: Material: grade A BK7, fused silica, sapphire, or CaF2 Diameter tolerance: +0.0, -0.12mm Paraxial focal length tolerance: ±2 Pourcent Centralization: 3arcmin Clear aperture: >85 Pourcent Surface figure: 1/2 at 632.8nm Surface q

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