15-015 150 mm Dia. N-BK7 Precision Aspheric Lens; EFL=150mm; NA=0.5 Uncoated

This is the 15-015 model from Edmund Optics, a 150 mm Dia. N-BK7 Precision Aspheric Lens with an effective focal length (EFL) of 150mm and a numerical aperture (NA) of 0.5, uncoated.

The lens is made of N-BK7, a popular glass type in the optical industry known for its excellent optical properties, including low auto-fluorescence and a high damage threshold. The lens's base shape is circular, and it has a diameter of 150 mm. The edge thickness of the lens is 7.51 mm, and the center thickness is 48.3 mm, providing a robust structure.

The lens's geometry is defined by several parameters. The inner radius is 0, and the outer radius is also 0, indicating a symmetrical design. The lens's radius of curvature (R1) is 77.52 mm, and R2 is 0, suggesting a high degree of asphericity. The back focal length (BFL) is 118.16 mm, and the effective focal length (EFL) is 150 mm, which is the same as the catalog number. The lens's numerical aperture (NA) is 0.5, indicating a wide acceptance angle and high light-gathering capability.

The lens is uncoated, which means it does not have any anti-reflective coatings. While this may result in higher reflective losses, it also means that the lens is more cost-effective and easier to clean. The lens's shape is aspheric, which is ideal for applications requiring high-quality imaging or beam shaping.