Tamron SP 35-80mm f/2.8-3.8 CF Macro zoom lens is the best zoom lens ever manufactured in its class. It produces exceptional contrast and sharpness. The continuous focusing mechanism automatically turn as needed to acquire proper focusing at infinity. The lens also features BBAR multicoating to minimize lens reflection and dispersion that is the result of flare and ghosting. Additioanlly, the BBAR enhances the light transmission promising top performance in many photographic conditions.