45-209 12.5 mm Dia. N-BAF10/N-SF5 Achromatic Doublet; EFL=14mm MgF2 400-700nm

The 45-209 is a high-quality achromatic doublet lens, sourced from the renowned optical 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 focal length (EFL) of 14mm, which is a crucial parameter in lens selection. The EFL determines the lens's magnification power and is a key factor in determining the overall optical system's performance.

The lens is constructed from two types of glass, N-BAF10 and N-SF5, both from Schott's extensive catalog. These glasses are chosen for their specific refractive indices and dispersion properties, which contribute to the lens's achromatic design. This design ensures that the lens effectively corrects chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.

The lens's geometry is also meticulously designed. It features a central thickness of 6.23mm, with an edge thickness of 5.34mm. The lens's inner and outer radii are 0, indicating a symmetrical design. The curvature radii (r1, r2, and r3) are 10.6mm, -7.72mm, and -56.54mm, respectively, contributing to the lens's overall optical power and aberration correction.

The lens's surfaces are coated with Edmund Optics' standard MgF2 coating, which provides excellent broadband anti-reflection performance. This coating enhances the lens's transmission, reduces ghosting and flaring, and improves overall image quality.