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Lens We can do many kinds of achromatic lens in your requirement .If you interest in our products.you can send the drawing or your specific requirement to our e-mail Detailed Product Description We make lenses with diameter from 1.0mm to 300mm by optical glass or optical crystals, such as BK7, fused silica, 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% Centralization: 3arcmin Clear aperture: >85% Surface figure: 1/2 at 632.8nm Surface quality: 60/40 scratch/dig Bevel: 0.25mm x 45° Coating: uncoated or coated upon requests We supply standard lens (please visit our website for standard lenses) and customized or OEM lenses upon customers' requests. Our Products are fully customisable, your further requests are welcome!