The Pentax SMC 55 mm f/1.8 is a prime lens suitable for street or documentary photography. With a 6 elements in 5 groups lens construction, this Pentax prime lens corrects aberrations that occur in photos. The f/1.8 maximum aperture of this Pentax prime lens enables you to take adequate bright images even in complete darkness. Also useful for macro photography, the Pentax SMC 55 mm f/1.8 prime lens is an efficient tool in the photographer’s arsenal.