A pair of hybrid aspherical lens elements work together to produce high-quality wide-angle images with the Tamron SP AF Aspherical lens. This 14 mm f/2.8 lens has a larger-than-average aperture to create extremely sharp focus upon the subject of the photo. The push/pull design of the switch cover over the focus ring is designed to maximize the ease of use that the Tamron SP AF Aspherical lens provides. Manual adjustments of the 14 mm f/2.8 lens are simple and the clarity of the image is stunning with this Tamron camera lens for Pentax. The rear element of the Tamron SP AF Aspherical lens is fitted to hold a gel filter for color correction and other effects as needed. Users of the Tamron camera lens for Pentax will enjoy clear images with maximum lighting even to the corners of the picture. At a weight of 1.5 lbs, this camera accessory is moderately sized and portable for serious photographers looking to set up a high-quality shoot with crisp details.