This is a Plano-Concave Lens, a type of spherical lens, sourced from Holmarc Opto-Mechatronics. The lens has a base shape of a circle and a diameter of 50mm. The thickness at the center of the lens is 2.5mm. The effective focal length (EFL) of this lens is -80mm, indicating that it is a diverging lens, causing parallel rays to spread out.
The lens is made of N-BK7, a type of glass commonly used in optical systems due to its excellent optical properties. The inner and outer radii of the lens are both 0mm, suggesting a symmetrical curvature.
The lens is uncoated, meaning it does not have any additional layers to enhance its optical properties. This may result in a decrease in transmission and an increase in reflection, especially at the edges of the visible spectrum. However, uncoated lenses are often more cost-effective and can be suitable for many applications.
This lens is suitable for use with a wavelength of 587.6nm. The item data does not specify whether this is a single wavelength or a range, so it is important to check this detail with the vendor.