49-286-INK 50 mm Dia. N-BAK4/N-SF10 Achromatic Doublet; EFL=200mm VIS 0° 425-675nm

The 49-286-INK is a high-quality achromatic doublet lens, boasting a 50 mm diameter and an effective focal length (EFL) of 200 mm, specifically designed for the visible light spectrum ranging from 425 to 675 nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase on their official website.

This achromatic doublet is meticulously crafted from two distinct types of Schott glass: N-BAK4 and N-SF10. These materials are carefully selected to minimize chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. By combining these materials, the 49-286-INK achieves superior color correction, delivering sharp and clear images across the entire visible light spectrum.

The lens features a robust geometry, with a thickness of 9.11 mm at the edge and 9 mm at the center. The center thickness can be further reduced to 3.5 mm, providing additional flexibility for various optical system configurations. The lens also has a curved shape, with inner and outer radii of 0, and a first radius (r1) of 130.48 mm and a second radius (r2) of -99.36 mm. These parameters contribute to the lens's excellent optical performance.

The 49-286-INK is equipped with standard EDMM Vis-0 coatings on both the front and back surfaces. These coatings are designed to enhance the lens's light transmission and durability, making it an ideal choice for a wide range of applications.