The SLB-15B-30PIR1 is a spherical lens with a base shape of a circle, sourced from the reputable vendor OptoSigma. This lens is designed for use with a wavelength of 546.1 nm and is made from the high-quality material n-bk7 schott. The lens features a double-convex geometry, with a diameter of 15.0 mm and a thickness at the edge of 2.0 mm. The thickness at the center of the lens is 3.8 mm, and it has an effective focal length (EFL) of 30.6 mm. The front and back of the lens are coated with opt ir1, providing excellent performance in the infrared spectrum, specifically between 633 and 1064 nm. The back focal length (BFL) of the lens is 29.4 mm, and it does not have an inner or outer radius. This lens is currently in stock and available for immediate purchase.