The 67-438 is a Plano-Convex lens, a type of spherical lens, sourced from Edmund Optics. This lens boasts a diameter of 2.5mm and a focal length of 5.0mm, making it a compact yet powerful optical component. The lens is made from the material n-lasf9 schott, a detail that could be crucial for users looking for specific material properties.
The lens features a front and back coating of edm nir-ii std curve, which is particularly noteworthy as it enhances the lens' performance in the near-infrared spectrum, specifically between 750nm and 1550nm. This coating makes the lens ideal for applications that require high transmission in the NIR-II range.
The geometry of the lens is also worth noting. It has a thickness of 0.61mm at the edge and 0.8mm at the center. The inner and outer radii are both 0, indicating a flat surface on one side and a curved surface on the other. The radius of curvature (r1) is 4.25mm, and the back focal length (bfl) is 4.57mm. The effective focal length (efl) is 5mm.