The SP AF 70-200mm F2.8 Di LD (IF) Macro is a fast telephoto zoom lens employing Tamron's Special Performance, Digitally Integrated and Internal Focusing technology. The 'SP' designates this to be a member of Tamron's top-line 'Special Performance' range, 'Di' indicates that it is 'Digitally Integrated' (i.e. optimized for DSLR use, but still covering the full-frame 35mm format), and IF reveals that it incorporates an internal focusing mechanism. The 'Macro' description provides a clue to one of this lens's more interesting characteristics, a minimum focusing distance of 0.95m, with a maximum magnification ratio of 0.32x. It's lens construction offers 18 elements in 13 groups with three low dispersion glass elements for reduction in chromatic aberrations to produce high quality images. It's nine bladed diaphragm produces an elegant bokeh or blurred background effect.