Tamron SP AF 90mm F/2.8 Di Macro 1:1 - £355
At f/2.8 the Tamron lens produces some of the most impressive results, although this is confined to the centre of the frame.
Considering the chromatic aberration it produces in the centre, it's surprising that it doesn't escalate much further at the edges.
Distortion could be improved, with only the Nikon and Olympus lenses faring worse, but it isn't much worse than the next couple ahead of it.
Image test verdict
Despite distortion and fringing problems, the Tamron lens is impressive for its price. Even at its widest aperture, it records excellent central sharpness.