45-222 25 mm Dia. N-BAF10/N-SF10 Negative Achromatic Doublet; EFL=-100mm MgF2 400-700nm

The 45-222 is a high-quality negative achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a 25 mm diameter, is designed for use in the 400-700nm spectral range, making it suitable for a wide range of optical applications.

The lens features a negative doublet geometry, which is a combination of two lenses of different materials to correct chromatic aberration. The first element is made of N-BAF10, a high-index, low-dispersion glass from Schott, while the second element is made of N-SF10, another high-index, low-dispersion glass from Schott. This combination provides excellent achromatic performance, minimizing color fringing and improving image quality.

The lens has an effective focal length (EFL) of -100mm, which is the distance from the lens's principal point to the focal point. This negative EFL indicates that the lens is a diverging lens, which spreads out light rays. The lens also has a large inner radius and outer radius, both of which are 0, indicating that it is a symmetrical lens.

The 45-222 lens features a center thickness of 2mm and an edge thickness of 5.81mm. The center thickness 'a' is 2.57mm. These thicknesses are crucial in determining the lens's optical performance and mechanical stability.

The lens is coated with Edmund Optics' standard MgF2 coating on both the front and back surfaces. This coating provides excellent broadband anti-reflection performance, reducing surface reflections and improving transmission.