The test results of the Sigma A 105 mm f/2.8 DG DN Macro are so explicit that we don't have to write a long summary. When a lens with a very long list of pros is able to break resolution records and it has just one, not especially important flaw, there is nothing to do but to recommend that...
solid and stylish casing,, sensational image quality in the frame centre,, excellent image quality on the edge of the APS-C sensor,, good image quality on the edge of full frame,, slight spherical aberration,, lack of any problems connected to longitudinal chromatic aberration,, negligible lateral...
too slow autofocus.