49-940-INK 12.5 mm Dia. N-BAF10/N-SF57 Achromatic Doublet; EFL=17.5mm VIS 0° 425-675nm

The 49-940-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 light spectrum, specifically between 425 and 675 nanometers. The lens boasts an effective focal length (EFL) of 17.5 mm, making it suitable for a wide range of optical applications.

The lens is constructed from two types of glass, N-BAF10 and N-SF57, both from Schott. This combination helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The use of these materials ensures that the lens provides clear, sharp images across the entire visible light spectrum.

The 49-940-INK features a standard curve coating on both the front and back surfaces. This coating enhances the lens's durability and resistance to environmental factors, while also reducing surface reflections and improving light transmission. The lens has a thickness of 5.08 mm at the edge and 5.8 mm at the center, with an inner radius of 0 and an outer radius of 0.

This lens is a multiplet, meaning it is composed of multiple elements. The curvature of these elements is defined by radii of 12.2 mm for the first surface and -9.82 mm and -39.19 mm for the second and third surfaces, respectively. The lens also has a central thickness of 1.5 mm, providing additional structural integrity.