Fast F2.8 aperture, compact size and exceptionally versatile 20-40mm zoom range. High image quality in a compact, lightweight body with 12 elements in 11 groups. TAMRONs VXD linear motor for high-level AF speed and precision. Wide macro shooting: MOD of 0.17m (6.7 in) and maximum magnification ratio of 1:3.8 at the wide end. TAMRON Lens Utility software for Focus Ring Function setting and firmware updates