This is a Plano-Concave Lens, type of Spherical Lens, offered by Standa, a renowned vendor in the optical industry. The lens is designed with a base shape of Circular and is available in the Material ID of n-bk7 schott.
The lens has a diameter of 25.4 mm and a thickness edge of 4 mm, with a thickness center of 3.9 mm. The effective focal length (EFL) is -2000 mm, indicating a concave lens. The radius of curvature (R1) is -1037.4 mm. The lens does not have any coating, as indicated in the coating parameter.
The lens is designed to operate at a wavelength of 546 nm. The lens is uncoated, which means it does not have any anti-reflective coating. This could lead to unwanted reflections, but it also means that the lens is less prone to damage from environmental factors.
The lens is in stock and available for immediate purchase. For more information, you can visit the vendor's website through the provided weblink.