The Pentax 55-300 mm f/4.0-5.8 is a high-performance zoom lens with x0.28 macro magnification that allows you to capture distant images, clearly. With a lens construction of 12 elements in 8 groups, this Pentax zoom lens delivers crisp and sharp pictures. The six diaphragm blades of this Pentax camera lens provide exceptional background effects. The Pentax 55-300 mm f/4.0-5.8 camera lens has ED glass elements that provide refined pictures with minimum aberration. Save your Pentax zoom lens from the harshness of the environment with the 58 mm filter size. The f/32 minimum aperture of this Pentax camera lens lets you capture great outdoor images.