Unlike other XF lenses, Fujifilm decided to omit the aperture ring on this lens which enables it to be more compact. The field-of-view of a 27mm lens is equivalent to a 40.5mm lens on a full frame format camera. While the max. aperture of f/2.8 can be generally considered as quite fast, it is rather slow within the specific scope of a standard lens. This is one drawback of using pancake lenses which tend to be slower than conventional designs. It is a simple lens with few mechanical parts. The build quality is high, generally constructed of plastic but with a metal mount.