The 49-774 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is designed with a 12.7 mm diameter and features an effective focal length (EFL) of 31.75mm, making it suitable for a wide range of optical applications.
The lens is constructed from two types of Schott glass, N-SSK8 and N-SF56, which are renowned for their excellent optical properties. The use of these materials in a doublet configuration helps to minimize chromatic aberration, ensuring sharp and clear images across the visible spectrum, specifically within the 425-675nm range.
The lens geometry is carefully crafted, with a central thickness of 4mm and edge thickness of 4.45mm. The first and second radii are R1=21.13mm and R2=-16.69mm, respectively, while the third radius, R3, is -61.73mm. These parameters contribute to the lens's overall performance and optical quality.
The lens surfaces are coated with Edmund Optics' standard Vis-0 coating, which is applied to both the front and back surfaces. This coating is designed to enhance the lens's transmission within the visible spectrum, further optimizing its performance for various applications.