The Tamron 11-20mm F2.8 zoom is an ultra wide-angle zoom lens for Sony E-mount APS-C mirrorless cameras. Despite its fast F2.8 aperture, the lens is very small (3.4”) and light. Special lens elements include aspherical, extra-low-dispersion and low-dispersion, while a BBAR-G2 coating reduces ghosting and flare. A stepping motor drives the focus group.
The lens has a minimum focus distance of 5.9” and a maximum magnification ratio of 0.25x. The lens is weather-sealed