47-708 18 mm Dia. N-SSK8/N-SF10 Achromatic Doublet; EFL=50mm VIS 0° 425-675nm

The 47-708 is an 18 mm diameter achromatic doublet lens, designed and manufactured by Edmund Optics. This lens boasts an effective focal length (EFL) of 50mm, specifically tailored for the visible light spectrum, spanning 425-675nm.

The lens is constructed from two types of Schott glass, N-SSK8 and N-SF10, each selected for their unique optical properties. The N-SSK8 glass is used for the first element, while the second element is made of N-SF10 glass. This combination helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.

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 improves overall system performance.

The lens geometry is characterized by a thickness of 5.69mm at the edge, with a central thickness of 5mm and a central thickness 'a' of 2.3mm. The lens curvature is defined by radii r1, r2, and r3, which are 27.12mm, -25.66mm, and -538.7mm respectively. The inner and outer radii are both zero, indicating a circular shape.

According to the vendor's information, this item is currently in stock and available for purchase. The item's catalog number is 47-708, and it can be found on the Edmund Optics website using the provided weblink.