The Schneider Optics 21-1062672 lens is a 50mm 5 megapixel lens with a M43 x 0.75 filter size, -0.1% distortion.

EMERALD lenses are ultra-low distortion lenses with an image circle diameter of 43.2 mm featuring compact, robust, locking focus and iris, designed for close up range or infinity and optimized for a uniform image quality over the whole sensor area. The 400-1000 nm broadband coating makes them suitable for applications in the visible and the near infrared spectrum. The option of alternative mounts like e.g. Canon bayonet or M42 thread makes them even more flexible for a wide range of applications in machine vision, quality control, web inspection and other image processing applications.