This is a Plano-Convex Lens, type Lens, subtype Spherical Lens, base shape Circular, and geometry as follows: The diameter of the lens is 50.8 mm, the thickness at the edge is 4.2 mm, and the thickness at the center is 5 mm. The effective focal length (EFL) is 800 mm, the radius of curvature (R1) is 413.36 mm, and the inner and outer radii are 0 mm.
The lens is made of n-bk7 schott material and is designed for a wavelength of 546 nm. The lens shape is Spherical, and it does not have any coating. The vendor for this lens is Standa.
According to the provided data, this lens is in stock and available for purchase. The link to the vendor's website is: http://www.standaphotonics.com/lenses/plano-convex-lenses.php
This lens is suitable for various optical applications where a long focal length and a large diameter are required. Its uncoated surface provides a clear and undistorted image, making it ideal for applications that do not require anti-reflection or other specialized coatings.