67-247 40 mm Dia. N-SF5 Precision Aspheric Lens; EFL=25mm; NA=0.8 Uncoated

The 67-247 is a high-precision aspheric lens, boasting a 40 mm diameter and a numerical aperture (NA) of 0.8. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase on their official website. The product link provided in the item data indicates that the lens is currently in stock, ensuring prompt delivery for your optical project needs.

The lens is made from N-SF5 Schott, a high-quality optical glass known for its excellent transmission properties and chemical resistance. The aspheric design of the lens, combined with its large diameter and high NA, makes it an ideal choice for applications that require high-resolution imaging, such as microscopy, beam shaping, or laser applications.

The geometry of the lens is carefully crafted, with an inner radius of 0 mm and an outer radius also at 0 mm. The lens has a thickness of 1.49 mm at the edge and a focal length (EFL) of 25 mm. The first radius of curvature (R1) is 16.18 mm, while the second radius (R2) is 0 mm. The back focal length (BFL) is 15.73 mm, and the lens has a center thickness of 15.5 mm.

The lens is uncoated, which means it does not have any anti-reflective or other surface coatings. This may result in higher reflective losses, but it also ensures that the lens maintains its original optical properties without the potential distortions that can be introduced by coatings.