Offering a wide angle of view for full frame cameras, the Sony A mount Tamron SP 15-30mm f/2.8 Di USD Lens is a fast wide-angle zoom lens . The f/2.8 maximum aperture performs well in low-light situations, and provides a shallow depth of field for selective focus. XGM and LD glass elements reduce chromatic aberrations and help ensure sharp and clear imagery. eBAND and BBAR coatings render uniform colors and reduce ghosting and flare, while a fluorine coating on the front element helps repel water or contaminants.