This is a Plano-Convex Lens, a type of spherical lens, sourced from the reputable vendor Standa. The lens has a circular base shape and is designed for use in a variety of optical applications. The lens is uncoated, which means it does not have any additional layers to enhance or modify its optical properties.
The lens has a diameter of 25.4 mm and a thickness at the edge of 2 mm. The thickness at the center of the lens is 7.9 mm. The effective focal length (EFL) of the lens is 40 mm, which is the distance from the lens's principal point to the focal point when the lens is focused at infinity.
The lens is made from CAF2 (Calcium Fluoride) material, specifically the variant mal-1963. This material is known for its excellent transparency in the ultraviolet region of the spectrum, making it suitable for applications that require high transmission of UV light. The wavelength of the lens is 2940 nm, which falls within the infrared region of the spectrum.