This is a Plano-Convex Lens, a type of spherical lens, sourced from Standa. It is a circular lens with a diameter of 50.8 mm and a base shape of Plano-Convex, meaning one side is flat while the other is curved. The lens has a thickness of 3 mm at the edge and 7.2 mm at the center, with an effective focal length (EFL) of 150 mm.
The lens is made of n-BK7 Schott, a high-quality optical glass known for its excellent transparency and low auto-fluorescence. The wavelength for this lens is 546 nm. The lens does not come with any coating, as indicated by the empty "coating" field in the item data.
This lens is currently in stock and available for purchase. For more information, you can refer to the vendor's website at http://www.standaphotonics.com/lenses/plano-convex-lenses.php.