This is a Plano-Convex lens, type of spherical lens, with a circular base shape and a diameter of 18 mm. The lens has a thickness of 1.8 mm at the edge and 4.67 mm at the center. The effective focal length (EFL) of this lens is 30 mm. The radius of curvature (R1) is 15.56 mm, and the back focal length (BFL) is 26.92 mm. The inner and outer radii are both 0 mm, indicating a flat surface on one side of the lens.
The lens is made of N-BK7, a type of glass commonly used in optical applications due to its excellent optical properties. The wavelength for this lens is 546.1 nm. The lens does not have any coating, as indicated by the empty 'coating' field in the item data.
The lens is sourced from CeNing Optics, a reputable vendor in the optical industry. According to the item data, the lens is in stock and available for purchase. The vendor's website provides further information about this lens and other products.