SLB-20B-70PIR1 20.0 mm Dia. x 70.6 mm FL; Coated; Double-Convex Lens 633-1064nm

The SLB-20B-70PIR1 is a high-quality lens from OptoSigma, designed for use in a wide range of optical applications. This lens features a spherical design, with a base shape of a circle, making it suitable for a variety of uses.

The lens has a diameter of 20.0 mm and a thickness at the edge of 2.0 mm. The thickness at the center is 3.4 mm, providing a robust structure that can withstand typical use. The effective focal length (EFL) of this lens is 70.6 mm, making it a medium to long-range lens.

The SLB-20B-70PIR1 is made from n-bk7 schott, a high-quality glass material known for its excellent optical properties. This material is often used in precision optical applications due to its low auto-fluorescence, high damage threshold, and excellent transmission in the visible and near-infrared regions.

The lens is coated with opt ir1 on both the front and back surfaces. This coating enhances the lens's performance by reducing reflection and increasing transmission, making it more efficient in transmitting light.

The radius of curvature for the first surface (R1) is 72.66 mm, while the second surface (R2) has a radius of -72.66 mm. This double-convex lens design provides a wide field of view and low distortion, making it ideal for imaging applications.

The back focal length (BFL) of this lens is 69.4 mm, and the inner and outer radii are both 0 mm. This lens is designed to be used with a 546.1 nm wavelength, making it suitable for a wide range of applications in the visible light spectrum.