65-976 25 mm Dia. N-FK5/F2HT Achromatic Doublet; EFL=50mm UV-VIS 345-700nm

The 65-976 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and a focal length of 50 mm, specifically designed for UV-VIS applications within the 345-700nm range. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available directly from their website.

The lens is constructed from two types of Schott glass: N-FK5 for the first element and F2HT for the second. This combination helps to minimize chromatic aberration, ensuring sharp and clear images. The lens features a standard UV-VIS coating on both the front and back surfaces, further enhancing its performance and durability.

The geometry of the lens is carefully designed to optimize its optical properties. The first surface has a radius of curvature of 30.03 mm, while the second surface has a radius of -24.15 mm. The center thickness of the lens is 8 mm, with a reduced thickness of 2.5 mm at the edge. The inner and outer radii are both zero, indicating a simple, circular shape.

This lens is a multiplet, meaning it is composed of multiple elements. The precise arrangement and alignment of these elements contribute to the lens's overall performance. The 65-976 is a versatile and reliable choice for a wide range of optical applications, particularly those requiring high-quality imaging in the UV-VIS spectrum.