This is a Plano-Concave Lens, type Lens, sourced from EKSMA Optics. The lens has a Sub Type of Spherical Lens and a Base Shape of Circular. The lens is uncoated, as indicated in the 'coating' parameter which is an empty object.
The lens has a diameter of 25.4 mm and a thickness edge of 3.9 mm. The thickness at the center of the lens is 3.6 mm. The Effective Focal Length (EFL) of the lens is -450 mm. The first radius of curvature (r1) is -233.4 mm, and the Inner Radius and Outer Radius are both 0 mm.
The lens is made of n-bk7 schott material, as indicated in the 'Material ID' parameter. The wavelength of the lens is 546 nm. The lens's shape is spherical.
The lens's web link is valid and in stock, as indicated in the 'weblink status' parameter. The web link for this lens is http://eksmaoptics.com/optical-components/lenses/plano-concave-lenses/.