49-315 9 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=27mm VIS-NIR 400-1000nm

The 49-315 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning 400-1000nm. The lens boasts a 9mm diameter and an effective focal length (EFL) of 27mm, making it suitable for a wide range of optical applications.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, a leading manufacturer of high-quality optical glass. This combination of materials helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The achromatic design ensures that the lens focuses both red and blue light to the same point, providing sharper images and improved color accuracy.

The lens geometry is carefully designed with a thickness of 4.26mm at the edge and 3.89mm at the center. The center thickness reduces to 1.3mm at the center a, providing a compact and efficient design. The lens features a curvature of 15.36mm on the first surface (r1) and -12.01mm on the second surface (r2), with a third surface (r3) of -39.56mm. These curvatures contribute to the lens's achromatic properties and its overall optical performance.

The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000) on both the front and back surfaces. This coating is designed to enhance the lens's performance in the VIS-NIR spectrum, reducing reflection and improving transmission. The lens is currently in stock and available for immediate purchase, as indicated by its valid weblink status.