This is the HO-BVL25-08C 25mm Dia. N-BK7 Double-Concave Lens, a high-quality optical component sourced from Holmarc Opto-Mechatronics. The lens is designed with a base shape of a circle and features a double-concave geometry, making it suitable for a wide range of optical applications.
The lens has a diameter of 25mm and a center thickness of 2.5mm. It boasts an effective focal length (EFL) of -200mm, indicating its concave nature. The first radius of curvature (R1) is -209.20156, while the second radius (R2) is 209.20156, further emphasizing its double-concave design. The lens does not have an inner or outer radius.
The lens is made from N-BK7 Schott, a popular optical glass known for its excellent optical properties. It is designed to work with a wavelength of 587.6nm. The lens features a single layer of MgF2 coating on both the front and back, providing superior anti-reflective properties and improving its overall performance.
This lens is available from Holmarc Opto-Mechatronics and is currently in stock. For more information, you can refer to the vendor's website at https://www.holmarc.com/bi_concave_lenses.php.