At around $420, this relatively affordable, compact and lightweight (420g) full-frame zoom with an 11x range and minimum focus distance of 0.49m (19.3in) sounds like an appealing option. As for image quality, it’s a slightly different story. On the one hand, the Tamron has low levels of chromatic aberration but, on the other, the resolution is low from 100mm onwards. Vignetting is also an issue on full-frame cameras at maximum aperture (but that’s common, and easily corrected in post). For the record, the tiny Tamron averaged a DxOMark score of 9.8 on a Sony Alpha 900 and 8 on a 16-Mpix APS-C Alpha 580.