LensTip.com

Lens review

Sigma 105 mm f/2.8 EX DG OS HSM Macro

20 September 2011
Arkadiusz Olech

7. Coma, astigmatism and bokeh

Coma is corrected very well here. In the corner of the APS-C/DX sensor its influence on the image of a diode is practically imperceptible and in the corner of full frame – slight. The lens definitely deserved our praise here.

Sigma 105 mm f/2.8 EX DG OS HSM Macro - Coma, astigmatism and bokeh

The astigmatism correction should be assessed in similar terms. The average difference between horizontal and vertical MTF50 function values amounted to only 3.4% which is very low.


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Photos of out-of-focus images of the diode, published below, might help you to assess how the lens renders fuzziness. Particularly the aperture is indeed nicely circular and the light is spread very evenly across the fuzziness.

Sigma 105 mm f/2.8 EX DG OS HSM Macro - Coma, astigmatism and bokeh