The 89-139 is a high-quality spherical lens, boasting a double-convex design and a base shape of a circle. This lens, sourced from the reputable vendor Edmund Optics, is a versatile optical component with a diameter of 9mm and a focal length of 27mm. The lens's geometry is meticulously crafted, with an edge thickness of 2mm and a center thickness of 2.74mm, ensuring optimal performance.
The lens's effective focal length (EFL) is 27mm, making it suitable for a wide range of applications. The first radius of curvature (R1) is 27.43mm, while the second radius (R2) is -27.43mm, indicating its double-convex nature. The back focal length (BFL) is 26.08mm, providing additional flexibility in its use.
The lens is made from the renowned material N-BK7 Schott, a borosilicate crown glass known for its excellent optical properties. The wavelength for this lens is 587.6nm, which is in the visible light spectrum.
The lens features a VIS-EXT coating on both the front and back, enhancing its performance in the visible light spectrum (350-700nm). This coating ensures high transmission and low reflection, making it an ideal choice for applications that require clear, bright, and undistorted images.