The Schneider Super-Angulon 90mm f/5.6 is a wide-angle large format lens produced by Schneider-Kreuznach of Germany, designed for 4x5 and larger format view cameras. The 90mm focal length provides a wide angle of view on 4x5, equivalent to approximately 28mm in 35mm terms, making it a standard choice for landscape, architectural, and interior photography on large format. The Super-Angulon is a retrofocus wide-angle design developed specifically for large format photography, providing a wide angle of view with an image circle large enough to accommodate significant camera movements. The optical formula delivers even illumination across the full image circle with controlled distortion. The 90mm f/5.6 provides an image circle sufficient to cover 4x5 inch film with room for camera movements.