67-332 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=750mm VIS 0° 425-675nm

The 67-332 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length (EFL) of 750mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the renowned optical components manufacturer, Edmund Optics, and is available for purchase through their official website.

The lens is constructed from two types of glass: N-BK7 and N-SF5, both from Schott, ensuring excellent optical performance. The N-BK7, a borosilicate crown glass, is known for its low dispersion and exceptional homogeneity, while the N-SF5, a fluorite crown glass, offers a low refractive index and low dispersion. This combination effectively minimizes chromatic aberration, a common issue in optical systems.

The lens features a standard anti-reflection coating, denoted as "edm vis-0 std curve" on both the front and back surfaces. This coating enhances light transmission, reduces surface reflections, and increases the overall efficiency of the optical system.

The geometry of the lens includes a thickness of 4.75mm at the edge, a center thickness of 2.5mm, and a thickness of 2.5mm at the back aperture. The lens's base shape is circular, and it has no inner or outer radii, indicating a simple, straightforward design.