49-273 3 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=12mm VIS 0° 425-675nm

The 49-273 is a high-quality achromatic doublet lens, sourced from Edmund Optics, featuring a 3 mm diameter and an effective focal length (EFL) of 12 mm, specifically designed for the visible light spectrum ranging from 425 to 675 nm. This lens is a multiplet, meaning it is composed of multiple optical components, in this case, two, to achieve superior chromatic correction and overall performance.

The lens's front and back surfaces are coated with the EDM VIS-0 standard curve coating, which enhances its light transmission capabilities and resistance to environmental factors, ensuring durability and longevity. The lens's geometry is meticulously designed, with an inner radius of 0 mm, an outer radius of 0 mm, and a center thickness of 1.68 mm, providing excellent optical precision and minimal aberrations.

The lens is made from two types of high-grade Schott glass, N-BK7 and N-SF5, known for their exceptional optical properties. The N-BK7, used for the first component, is a borosilicate crown glass, while the N-SF5, used for the second component, is a dense flint glass. This combination ensures the lens's ability to correct chromatic aberrations effectively.