67-331 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=160mm VIS 0° 425-675nm

The 67-331 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length (EFL) of 160mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the renowned optical components manufacturer, Edmund Optics.

The lens is crafted from two types of Schott glass: N-BK7 and N-SF5. These materials are carefully selected to minimize chromatic aberration, a common issue in lenses where different wavelengths of light are focused at different points. By combining these materials, the 67-331 achieves superior image quality and color correction.

The lens geometry is meticulously designed, with a center thickness of 3mm, edge thickness of 4.33mm, and radii of curvature of 107.2mm and -67.9mm for the first and second surfaces, respectively. The lens also features a third surface with a radius of -179.23mm, contributing to its achromatic properties.

The 67-331 is coated with Edmund Optics' standard anti-reflective coating, specifically designed for the visible light spectrum (VIS 0°). This coating reduces surface reflections, enhancing light transmission and improving overall image quality.

This lens is a multiplet, meaning it consists of multiple elements. This complex construction allows for the precise control of optical properties, making the 67-331 suitable for a wide range of applications where high image quality and color correction are paramount.