... Binger provides these lenses with the material of BK7, fused silica, sapphire, CaF 2 ... materials lense Transparent optical component consisting of one or more pieces of optical glass with curved surfaces (usually ... object, thus forming a real or virtual image of that object. Binger provides these lenses with the ... material of BK7, fused silica, sapphire, CaF 2 ...