This PENTAX DA645 28-45mm F4.5 ED AW SR Ultra Wide Angle Lens in black is a great option for those who want to capture stunning photos. With a maximum aperture of f/4.5 and a focal length of 28-45mm, this lens is perfect for capturing crisp and clear images. The lens is compatible with Pentax cameras and has both auto and manual focus options. The lens is a part of the Pentax DA series and has a mount of Pentax 645. It is an ultra-wide-angle lens that allows you to capture more of the scene in your photos. The lens is used but is in great condition and has been well-maintained.