The 01 8.5 mm F/1.9 is a high-performance standard prime lens in the Pentax Q-system which outperforms any expectations. Its natural perspective is similar to the one of the human eye, therefore it can be used as a multipurpose lens, for anything from landscapes to portrait photography. With maximum aperture of F/1.9 it gives excellent performance in low-light conditions and provides impressive depth of field. With its two aspherical optical elements aberrations, flare, and ghosting are kept to a minimum, while image detail is crisp and bright even at the edge of the image field. The Pentax lens coating produces beautifully defined images with vivid colors, and open aperture photography is possible in bright settings thanks to the Neutral Density filter.