Schneider XENON EMERALD series 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 Xenon-Emerald 2.8/28 mm is offered in two variants; S and L. The S version is offered for "close up" finite working distances typical of machine vision applications and the L version is offered for long working distances out to Infinity. Canon bayonet or M42 threaded options are available upon request.