Our Bi-convex lenses have the same radii on both sides of the lens, and the function is similar to plano-convex lenses by focusing parallel light to a single point. Comparing with PCX lenses, DCX lenses are more suitable when the object and image are on opposite sides and the ratio of the image and object distances (conjugate ratio) is between 0.2 and 5. These lenses are available uncoated or with a variety of antireflection coatings optimized in the VIS (400~700nm);NIR (650~1050nm) and SWIR(1000~1650nm). Also we can design and produce according to the needs of customers.