49-375-INK 30 mm Dia. N-SK11/N-SF5 Achromatic Doublet; EFL=125mm VIS-NIR 400-1000nm

The 49-375-INK is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a diameter of 30 mm, is designed for use in the visible to near-infrared spectrum, spanning 400-1000nm. The lens is specifically designed for use in multiplet configurations, making it an ideal choice for a wide range of optical applications.

The lens features an effective focal length (EFL) of 125mm, providing a long focal length that allows for high magnification and a narrow field of view. The lens is constructed from two types of glass, N-SK11 and N-SF5, both from the reputable Schott glass catalog. This combination of glasses helps to correct chromatic aberration, a common issue in optical systems, ensuring high-quality, clear images.

The 49-375-INK lens features a sophisticated coating design, with both the front and back surfaces coated with Edmund Optics' VIS-NIR0SP2002000 coating. This coating is designed to provide high transmission across the entire visible spectrum and into the near-infrared, ensuring optimal performance in a wide range of lighting conditions.

The lens geometry is carefully designed to provide excellent optical performance. The edge thickness is 5.52mm, providing robustness and durability. The lens features a center thickness of 4.92mm, reducing the risk of vignetting and ensuring a consistent image across the entire field of view. The lens also features a range of radii, including r1 at 81.53mm, r2 at -56.59mm, and r3 at -220.08mm, which are optimized to provide superior image quality.