47-719-INK 30 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=200mm VIS 0° 425-675nm

The 47-719-INK is a high-quality achromatic doublet lens, sourced from Edmund Optics, designed with a 30 mm diameter and a focal length of 200mm. This lens is specifically engineered for the visible light spectrum, spanning from 425 to 675nm.

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 lens 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 durability and resistance to environmental factors, while also reducing surface reflections, thereby improving light transmission.

The geometry of the lens includes a thickness of 6.15mm at the edge, a center thickness of 5mm, and a center thickness 'a' of 2.5mm. The lens's inner and outer radii are 0, and the radii of curvature are 123.77mm, -89.22mm, and -259.43mm for the first, second, and third surfaces, respectively.

According to the vendor's information, this item is currently in stock, and the web link provided leads to its product page on the Edmund Optics website.