SLB-25B-70P 25.0 mm Dia. x 70.7 mm FL; Double-Convex Lens Uncoated

The SLB-25B-70P is a high-quality double-convex lens, sourced from OptoSigma, a renowned vendor in the optical industry. 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, making it suitable for use in compact optical systems. The edge thickness is 2.0 mm, while the center thickness is 4.2 mm, providing a robust structure that can withstand typical handling and usage. The effective focal length (EFL) of this lens is 70.7 mm, which is a critical parameter in determining the lens's magnification and field of view.

The lens is made from n-BK7 Schott, a high-grade optical glass known for its excellent optical properties. This material ensures high transmission in the visible spectrum, making it ideal for applications that require clear, bright images. The lens surfaces are uncoated, which means they do not have any additional layers to enhance light transmission or reduce reflection. However, uncoated lenses can be a good choice for applications where cost or simplicity is a priority.

The curvature of the lens surfaces is defined by radii of 72.66 mm for the first surface and -72.66 mm for the second surface. These radii, combined with the lens's thickness, contribute to the lens's overall optical power and performance. The back focal length (BFL) of the lens is 69.3 mm, which is an important consideration when designing an optical system that includes this lens.