49-328-INK 12.5 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=50mm VIS-NIR 400-1000nm

The 49-328-INK 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 visible to near-infrared spectrum, spanning 400-1000nm. The lens is specifically engineered to bring two wavelengths into focus on the same plane, reducing chromatic aberration, a common issue in lens systems.

The lens is composed of two elements, each made from different materials: N-BK7 and N-SF5, both from Schott. The N-BK7, a borosilicate crown glass, is known for its excellent optical transmission and low dispersion, making it ideal for use in achromatic doublets. The N-SF5, a dense flint glass, has a higher refractive index and higher dispersion, which aids in the correction of chromatic aberration.

The lens has an effective focal length (EFL) of 50mm, providing a moderate magnification. The geometry of the lens includes a thickness of 4.06mm at the edge, with a central thickness of 3.5mm. The lens also features a front and back coating of EDm VIS-NIR 0SP200-2000, which enhances its transmission in the specified wavelength range.

This lens is available for purchase directly from the Edmund Optics website, and the link provided is valid and indicates that the lens is currently in stock. With its high-quality materials, precise geometry, and advanced coating, the 49-328-INK is an excellent choice for a wide range of optical applications.