The 17-50mm zoom with a high light intensity of 2.8 over the entire focal length range is a highest quality standard. It belongs to the Tamron SP (Super performance) high performance lenses, which are characterized by excellent optical and mechanical quality. The high brightness of the lens to take pictures even in low light and opened professional image design with beautiful semi-circular background and virtually exempted motifs at f/2.8. Their unlimited creativity and the quality of your pictures are in the Center.