This is a Plano-Concave Lens, type SLB-30-50NM, sourced from OptoSigma. The lens has a diameter of 30.0 mm and a focal length of -50.0 mm, making it suitable for a variety of optical applications. The lens is made of n-bk7 schott material, a popular choice for its high refractive index and low dispersion.
The lens features a spherical shape, with a center thickness of 2.0 mm and an edge thickness of 6.8 mm. The inner and outer radii are 0 mm, indicating a uniform curvature. The lens is coated with opt m on both the front and back surfaces, enhancing its transmission capabilities within the wavelength range of 400-700 nm.
This lens is currently in stock and available for immediate purchase. For more information, please refer to the vendor's website using the provided weblink.