Sigma S 150-600 mm f/5-6.3 DG OS HSM review - Coma, astigmatism and bokeh

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Sigma S 150-600 mm f/5-6.3 DG OS HSM

28 October 2014

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The tested lens corrects the coma very well – even in the corners of full frame it influences a point-like image of a diode in a negligible way. Some minimal effects can be noticed only at 150 mm focal length.

Sigma S 150-600 mm f/5-6.3 DG OS HSM - Coma, astigmatism and bokeh

The Sigma corrects the astigmatism splendidly as well. An average difference between horizontal and vertical MTF50 function values amounted to just 3%.

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Defocused images are very nice indeed. The circles of light feature an even light spread, without any distinct extremes. A noticeable truncation of these circles in the full frame corners is a separate problem, though; still it is rather connected with vignetting which we are going to describe in the next chapter.