The pentax fa 15 30mm f28 hd ed sdm wr lens is an ultra wide angle zoom designed specifically for k mount dslrs with full frame sensors thanks to its exaggerated perspective typical of an ultra wide angle lens and high resolution imaging power it captures dynamic sweeping views of subjects especially in landscape photography its large f28 maximum aperture also comes in handy for photographing nightscapes and starry skies the built in sdm supersonic direct drive motor provides quiet hi