49-939-INK 9 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=22.5mm VIS 0° 425-675nm

The 49-939-INK is a high-quality Achromatic Doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a catalog number 49-939-INK, is available for purchase directly from their website and is currently in stock. The lens boasts a 9mm diameter and an effective focal length (EFL) of 22.5mm, making it suitable for a wide range of optical applications.

The lens is composed of two types of glass, N-SSK8 and N-SF56, both from the reputable Schott glass manufacturer. This combination of materials helps to minimize chromatic aberration, a common issue in optical systems, thereby enhancing the overall image quality. The lens is coated with the EDM VIS-0 standard curve on both the front and back surfaces, which further improves its light transmission capabilities within the visible spectrum (425-675nm).

The lens geometry is carefully designed with a center thickness of 3mm and an edge thickness of 3.58mm. The inner and outer radii are 0mm, suggesting a symmetrical design. The lens also features a curvature with radii of 14.79mm and -12.09mm on the first surface, and -45.72mm on the second surface. This complex geometry allows for precise control over the optical path, making the lens suitable for a variety of applications.