Standard in focal length, but excellent in quality, the smc PENTAX DA Star 55mm for PENTAX digital SLR cameras is incredibly fast and offers outstanding depth of field control. The tightly sealed, weather-resistant and dust-resistant construction enhances durability for use in both rainy and dusty conditions, making the DA Star 55mm F1.4 SDM lens a perfect companion for the weather-resistant PENTAX DSLR bodies. Adding the PENTAX Aero Bright coating on internal lens elements offers ultra high refraction index for improved light transmission with minimal ghosting and flaring.