This is a Plano-Concave Lens, type of Spherical Lens, offered by Standa, a renowned vendor in the optical industry. The lens has a circular base shape with a diameter of 25.4 mm and a thickness that varies from 5 mm at the edge to 2.9 mm at the center. The effective focal length (EFL) of this lens is -75 mm, indicating that it is a diverging lens, causing parallel rays to spread out.
The lens is made of n-BK7 Schott, a popular optical glass known for its excellent optical properties, making it suitable for a wide range of applications. The wavelength for this lens is 546 nm, which is in the visible light spectrum.
The lens does not come with any coating, which means it is uncoated. This may lead to reflections and reduced transmission, but it also means that the lens is more cost-effective.
For more information about this lens, including its availability and other technical details, you can refer to the vendor's website through the provided weblink.