45-424 12.5 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-35mm MgF2 400-700nm

The 45-424 is a high-quality negative achromatic doublet lens, sourced from the renowned optical components vendor, Edmund Optics. This lens, with a diameter of 12.5 mm, is designed for use in the spectral range of 400-700nm, making it suitable for a wide range of optical applications.

The lens features a negative doublet design, which is a compound lens made up of two individual lenses. This design helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The negative achromatic doublet design ensures that the lens focuses light of different wavelengths onto a single point, improving the overall image quality.

The lens has an effective focal length (EFL) of -35mm, which is the distance from the lens's principal point to the point at which the lens focuses light. The negative EFL indicates that the lens is a diverging lens, which spreads out light rays. This can be useful in certain applications where a wider beam of light is required.

The lens is made from N-BK7 and N-SF5 Schott glass, which are both high-quality optical materials known for their excellent transparency and low dispersion. The lens is coated with EDM MgF2 std curve on both the front and back surfaces, which helps to reduce reflection and increase transmission.

The lens has a thickness of 4.74mm at the edge and 2mm at the center. The inner and outer radii are 0mm, indicating that the lens has a uniform curvature. The thickness at the center a is 1.56mm.