This is a HO-BVL50-20B 50mm diameter N-BK7 double-concave lens, featuring an effective focal length (EFL) of -1000mm. The lens is sourced from Holmarc Opto-Mechatronics, a reputable vendor in the optical industry.
The lens is designed with a base shape of a circle and is constructed with N-BK7 Schott glass, a popular choice for its high refractive index and low dispersion. The geometry of the lens includes a center thickness of 2.5mm, a first radius (R1) of -1043.762884mm, and a second radius (R2) of 1043.762884mm. The inner and outer radii are both zero.
The lens is coated with BBAR (Broadband Anti-Reflection) coating, optimized for the wavelength of 587.6nm. The BBAR coating is applied to both the front and back surfaces, reducing reflection and enhancing transmission across the spectral range of 400-700nm.
This double-concave lens is a spherical type, suitable for a wide range of optical applications. It is currently in stock and available for immediate purchase. For more information, please refer to the vendor's website at https://www.holmarc.com/bi_concave_lenses.php.