49-393-INK 50 mm Dia. N-BAK4/N-SF10 Achromatic Doublet; EFL=250mm VIS-NIR 400-1000nm

The 49-393-INK is a high-quality achromatic doublet lens, boasting a 50 mm diameter and an effective focal length (EFL) of 250mm. This lens is designed for use in the visible (VIS) and near-infrared (NIR) spectrum, specifically catering to the wavelength range of 400-1000nm.

This lens is a multiplet, meaning it is composed of multiple optical elements. The doublet structure consists of two different types of glass, N-BAK4 and N-SF10, both from the reputable Schott glass catalog. This combination is used to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.

The lens has a thickness of 10.54mm at the edge and 9.75mm at the center, providing robustness and durability. The center thickness is further reduced to 3.5mm with the 'a' variant, offering a more compact solution without compromising optical performance.

The lens features a front and back coating of EDm VIS-NIR 0SP200-2000, a proprietary coating from Edmund Optics that enhances the lens's performance in the VIS-NIR spectrum. This coating reduces surface reflections, increasing transmission and improving overall system efficiency.

The 49-393-INK lens is available from Edmund Optics and is currently in stock, according to their website. For more information, including pricing and availability, please refer to the provided weblink.