49-985 9mm Dia. x 27mm FL; Uncoated; UV Double-Convex Lens

The 49-985 is a high-quality spherical lens, specifically designed for use in optical systems requiring a convex-convex lens shape. Sourced from the reputable vendor, Edmund Optics, this lens boasts a 9mm diameter and a 27mm focal length, making it suitable for a wide range of applications.

The lens is crafted from fused silica, a material known for its excellent optical properties, including high transparency in the ultraviolet (UV) region. This makes the 49-985 an ideal choice for UV-based optical systems. The lens is uncoated, which can be beneficial in certain applications where a specific coating is not required or desired.

The lens's geometry is characterized by its double-convex shape, with radii of curvature of 24.36mm for the first surface and -24.36mm for the second. This shape results in a beneficial effect on the light passing through the lens, bending it towards the optical axis and focusing it at a point determined by the lens's focal length. The lens's edge thickness is 1.66mm, while the center thickness is 2.5mm, providing a robust and durable structure.

The lens's effective focal length (EFL) is 27mm, which, combined with its diameter, allows for a wide field of view while maintaining a compact form factor. The back focal length (BFL) is 26.13mm, which is crucial when considering the overall design and placement of optical elements in a system.