Thanks to its aspherical lens element, the powerful 2.0 / 40 mm Ultron SLII has the ideal combination of compactness and top imaging performance, making it a durable companion for full-size SLR reportage photography. The Ultron with Nikon connection also has a built-in CPU, which corresponds to the camera electronics and the exposure electronics informed of the set distance, which among other things leads to a finely dosed flash control.