SLB-25B-50P 25.0 mm Dia. x 50.8 mm FL; Double-Convex Lens Uncoated

The SLB-25B-50P is a high-quality double-convex lens, sourced from the reputable optical vendor, OptoSigma. This lens, with a base shape of a circle, is designed for use in a wide range of optical applications, thanks to its precise geometry and material composition.

The lens has a diameter of 25.0 mm, providing a substantial surface area for light transmission. The edge thickness is 2.0 mm, while the center thickness is 5.1 mm, indicating a robust construction that can withstand typical handling and usage. The effective focal length (EFL) of this lens is 50.8 mm, making it suitable for applications that require moderate magnification and a relatively long focal length.

The curvature of the lens is defined by its first and second radii of curvature, R1 and R2, which are 51.9 mm and -51.9 mm respectively. These values suggest a symmetrical, double-convex design, which is ideal for applications requiring a wide field of view and minimal distortion. The back focal length (BFL) of this lens is 49.2 mm, which should be considered when designing the optical system to ensure adequate clearance and alignment.

The lens is made from n-BK7 Schott, a popular optical glass known for its excellent optical properties and versatility. This material has a refractive index of 1.5168 at the specified wavelength of 546.1 nm. The lens is uncoated, meaning it does not have any anti-reflective or other surface treatments. This may be suitable for applications where such coatings are not required or desirable.