This is a G052403329 12.7 mm Dia. N-BK7 Mounted Double-Concave Lens, specifically designed for use with a wavelength of 588nm and featuring an effective focal length (EFL) of -50mm. The lens is sourced from Qioptiq Photonics, a renowned vendor in the field of precision optics.
The lens is of the Spherical type, with a Sub Type of Spherical Lens (Concave-Concave). It has a base shape of Circular and a diameter of 12.7mm. The center thickness of the lens is 1.5mm. The first radius of curvature (R1) is -52.33mm, and the second radius of curvature (R2) is 52.33mm. The inner and outer radii are both 0mm.
The lens is made from N-BK7 Schott, a popular material in the optical industry due to its excellent optical properties. The lens is coated with Qio HP Nbar Arhs-Yag on both the front and back surfaces, providing anti-reflection properties that enhance the lens' performance.
The weblink provided leads to a page where this lens is available for purchase and further details can be found. The link has been verified and is currently valid, indicating that the lens is in stock and ready for purchase.