49-289 50 mm Dia. N-BAK4/N-SF10 Achromatic Doublet; EFL=350mm VIS 0° 425-675nm

The 49-289 is a high-quality achromatic doublet lens, boasting a 50 mm diameter and an effective focal length (EFL) of 350 mm, specifically designed for the visible light spectrum ranging from 425 to 675 nm. This lens is sourced from the reputable optical vendor, Edmund Optics, and is available for purchase through their website.

This lens is a multiplet, meaning it is composed of multiple optical elements to achieve superior performance. The doublet configuration consists of two components, each made from different materials: N-BAK4 and N-SF10 Schott glass. These materials were carefully selected to minimize chromatic aberration, a common issue in lens systems where different wavelengths of light are focused at different points. By combining these materials, the 49-289 achieves excellent color correction, making it suitable for a wide range of applications.

The lens geometry is meticulously designed, with an outer radius of 0 and an inner radius of 0, indicating a simple, circular shape. The edge thickness measures 10.07 mm, while the center thickness is 8 mm, ensuring robustness and durability. The lens also features a front and back coating of edm vis-0 std curve, which enhances its light transmission capabilities and further contributes to its overall performance.