62-493-INK 25 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-75mm VIS 0° 425-675nm

The 62-493-INK is a 25 mm diameter negative achromatic doublet lens, sourced from Edmund Optics. This lens is specifically designed for the visible spectrum, with a wavelength range of 425-675nm. The lens boasts an effective focal length (EFL) of -75mm, making it suitable for a variety of applications.

The lens is composed of two materials: N-BK7 and N-SF5, both from Schott. The N-BK7, a borosilicate crown glass, is known for its excellent optical properties and durability. The N-SF5, a fluorite crown glass, offers low dispersion and high transmission in the visible spectrum. This combination of materials helps to correct chromatic aberration, a common issue in optical systems.

The lens features a standard curvature coating on both the front and back surfaces, denoted as 'edm vis-0 std curve'. This coating enhances the lens's light transmission capabilities and reduces surface reflections, thereby improving overall system performance.

The lens geometry includes a thickness of 8.9mm at the edge, with a central thickness of 2.5mm. The lens also features three radii of curvature: r1=-46.07, r2=36.65, and r3=108. These parameters contribute to the lens's overall optical performance.

According to the vendor's information, this item is currently in stock, and the associated web link provides further details and purchasing options.