69-852 10 mm Dia. N-SF5 Precision Aspheric Lens; EFL=7.5mm; NA=0.67 Uncoated

This is the 69-852 model from Edmund Optics, a 10 mm diameter precision aspheric lens made from N-SF5 Schott material. The lens boasts a high numerical aperture (NA) of 0.67, making it suitable for applications that require high light-gathering capabilities. The aspheric design of the lens helps to minimize spherical aberration, providing superior image quality.

The lens has an effective focal length (EFL) of 7.5mm, which is the distance from the lens's principal point to the focal point when the lens is focused at infinity. This EFL makes the lens suitable for use in compact optical systems. The lens also has a large clear aperture, which allows for high light throughput and low optical loss.

The lens is uncoated, meaning it does not have any anti-reflective coatings. While this may result in higher reflective losses, it also means that the lens is less susceptible to damage from environmental factors. The lens has a thickness of 2.21mm at the edge and 5mm at the center, providing structural rigidity.

The lens's geometry includes a range of parameters that define its shape and curvature. These include the inner and outer radii, the diameter, the thickness at the edge and center, and the conic constant (k1). These parameters are crucial in determining the lens's performance in a given optical system.