49-285 50 mm Dia. N-BAK4/N-SF10 Achromatic Doublet; EFL=150mm VIS 0° 425-675nm

The 49-285 is a high-quality achromatic doublet lens, boasting a 50 mm diameter and an effective focal length (EFL) of 150 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.

The lens is constructed from two types of Schott glass: N-BAK4 and N-SF10. These materials are 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 49-285 achieves superior color correction, making it an ideal choice for applications that require high-resolution imaging across the visible light spectrum.

The lens geometry is meticulously designed, with an inner radius of 0 mm and an outer radius of 0 mm. The edge thickness measures 8.92 mm, while the center thickness is 9.5 mm. The lens also features a 4 mm thickness at the center a. The curvature of the lens is defined by radii r1, r2, and r3, which measure 96.85 mm, -73.74 mm, and -241.63 mm, respectively. These parameters contribute to the lens's overall optical performance and field of view.

The 49-285 is coated with the EDM VIS-0 standard curve on both the front and back surfaces. This coating enhances the lens's transmission and reduces reflection, thereby improving overall light efficiency. The lens is available in a multiplet shape, offering flexibility for various optical system configurations.