The Schneider Kreuznach 28mm LS f/4.5 Aspherical is an ultra wide lens designed for Phase One medium format cameras that is perfect for landscape and architecture photography. It resembles an 18mm on classic 35mm photography. The lens is very sharp and has almost no distortion. Thanks to the leaf shutter there is very little distortion and it is possible to achieve a flash sync of 1/1600. 

Furthermore, the lens is composed of 14 elements in 10 groups, and has a minimum focusing distance of 35 cm. 

The dimensions of the lens are 90 x 136 mm and it weighs 1100g. 

NOTE: The front element is bent outward and there is no filter thread.