This is a Plano-Convex lens, a type of spherical lens with a flat surface on one side and a curved surface on the other. The lens has a base shape of a circle and a diameter of 50mm. The thickness of the lens at the edge is 3mm, and it has an effective focal length (EFL) of 200mm.
The lens is made of N-BK7, a type of glass commonly used in optical systems due to its excellent optical properties. The inner radius of the lens is 0mm, and the outer radius is also 0mm, indicating that the lens is a simple plano-convex design.
The lens is coated with BBAR (Broadband Anti-Reflection) coating, which is designed to reduce reflection and increase transmission of light over a broad spectrum (400-700nm). This coating is applied to both the front and back surfaces of the lens.
The vendor of this lens is Holmarc Opto-Mechatronics, a company known for its high-quality optical products. The lens is currently in stock and can be purchased directly from their website.