LB1258 N-BK7 Bi-Convex Lens; Dia:0.5 in; f=30.0 mm Uncoated

The LB1258 N-BK7 Bi-Convex Lens is a high-quality optical component sourced from Thorlabs. This lens, with a diameter of 0.5 inches and a focal length of 30.0 mm, is designed for use in a wide range of optical systems.

The lens is made from N-BK7, a popular glass type known for its excellent optical properties. This material, also known as Schott glass, is renowned for its low dispersion and high transmission across a broad spectrum, making it an ideal choice for many applications.

The LB1258 features a bi-convex geometry, meaning it has two spherical surfaces that are both convex, or outwardly curved. This design allows for a wide range of focusing capabilities, making it a versatile choice for many optical systems.

The lens has a diameter of 12.7 mm and a thickness of 1.8 mm at the edge, increasing to 3.1 mm at the center. The effective focal length (EFL) is 30.0 mm, and the radius of curvature for the first surface (R1) is 30.4 mm, while the second surface (R2) has a radius of curvature of -30.4 mm. The back focal length (BFL) is 28.9 mm.

This lens is uncoated, meaning it does not have any additional layers applied to its surfaces to enhance its optical properties. While this can make the lens more susceptible to environmental factors, it also means that it can be easily integrated into existing optical systems.

The LB1258 is currently in stock and available for immediate purchase from Thorlabs. For more information, please refer to the provided weblink.