LE1985 50.8 mm Dia. N-BK7 Positive Meniscus Lens; EFL=300mm Uncoated

The LE1985 is a spherical lens with a positive meniscus shape, sourced from the reputable optical components manufacturer, Thorlabs. This lens is made of N-BK7, a high-quality borosilicate glass, which is known for its excellent optical properties, making it a popular choice for various applications.

The lens has a diameter of 50.8 mm and a thickness of 3 mm at the edge, while the center thickness measures 5.1 mm. The effective focal length (EFL) of this lens is 300 mm, which is a common choice for many optical systems due to its versatility. The first radius of curvature (R1) is 100.1 mm, and the second radius (R2) is 279.1 mm. The back focal length (BFL) of the lens is 293.8 mm.

Notably, this lens is uncoated, which means it does not have any anti-reflective coatings. While this may result in higher reflective losses, it also means that the lens is more cost-effective and suitable for applications where such coatings are not necessary.

The lens data provided is valid and in stock, according to Thorlabs' website. This information is subject to change, and we recommend checking the vendor's website for the most up-to-date and accurate information.