45-423 25 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-150mm MgF2 400-700nm

The 45-423 is a high-quality negative achromatic doublet lens, sourced from the renowned optical components manufacturer, Edmund Optics. This lens, with a diameter of 25 mm, is designed for use in the spectral range of 400-700 nm, making it suitable for a wide range of optical applications.

The lens features a negative doublet design, which is a compound lens consisting of two individual lenses with opposite focal lengths. This design helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The achromatic property of this lens ensures that the chromatic aberration is minimized, resulting in clear, sharp images.

The lens has an effective focal length (EFL) of -150 mm, which is the distance from the lens's principal point to the point at which the light rays converge or diverge. The negative EFL indicates that the lens diverges light rays, which is typical of negative lenses.

The lens is made from two types of high-quality glass: N-BK7 and N-SF5, both from Schott. N-BK7, also known as borosilicate crown glass, is known for its excellent optical properties and high damage threshold. N-SF5, on the other hand, is a high-index, low-dispersion glass, which is often used in achromatic doublets to reduce chromatic aberration.

The lens surfaces are coated with EDM MgF2 std curve, a broadband anti-reflection coating that reduces reflection and increases transmission. This coating is standard for Edmund Optics lenses and provides high transmission across the visible spectrum.

The lens geometry includes a thickness edge of 7.73 mm, an inner radius of 0 mm, an outer radius of 0 mm, and a thickness center of 2.5 mm. The lens also features a thickness center a of 4.06 mm.

The lens is currently in stock and can be purchased directly from the Edmund Optics website.