All S-lenses come with an effective large lens hood which is slotted onto the accessories mount during transport, saving space. This fast, wide-angle lens is operates practically without distortion. It is therefore ideal for use indoors or for architectural photos. The SUMMARIT-S 2.5/35mm ASPH. uses two aspherical lens surfaces and special glass with anomalous partial dispersion or high refraction as well as rear-group focusing for the highest performance over the entire focusing range.