Sigma S 60-600 mm f/4.5-6.3 DG OS HSM
7. Coma, astigmatism and bokeh
| Center, 60 mm, f/4.5 | Corner APS-C, 60 mm, f/4.5 | Corner FF, 60 mm, f/4.5 |
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| Center, 100 mm, f/5.0 | Corner APS-C, 100 mm, f/5.0 | Corner FF, 100 mm, f/5.0 |
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| Center, 200 mm, f/5.6 | Corner APS-C, 200 mm, f/5.6 | Corner FF, 200 mm, f/5.6 |
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| Center, 300 mm, f/5.6 | Corner APS-C, 300 mm, f/5.6 | Corner FF, 300 mm, f/5.6 |
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| Center, 400 mm, f/6.3 | Corner APS-C, 400 mm, f/6.3 | Corner FF, 400 mm, f/6.3 |
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| Center, 600 mm, f/6.3 | Corner APS-C, 600 mm, f/6.3 | Corner FF, 600 mm, f/6.3 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 3.6% and it is a very good result. When you deal with lenses with such a wide focal range as that of the Sigma S 60-600 mm you should additionally show how the astigmatism results spread on particular focal lengths. In the 60-200 mm range this aberration level is negligible, being just 2.1%; then it increases at 300 mm and at 400 mm it reaches a peak of 6.1%. Finally it decreases to 5% at 600 mm.
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Out-of-focus images are very nice for a telephoto lens with such a high zoom ratio. Circles of light come with even light spread, without any noticeable local extremes or onion ring circles. We can have just one reservation, concerning a noticeably accented rim. You can also notice distinct truncation of circles in the corners of full frame but it’s an influence of mechanical vignetting which we are going to describe in the following chapter.
| Center, 300 mm, f/5.6 | Corner APS-C, 300 mm, f/5.6 | Corner FF, 300 mm, f/5.6 |
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| Center, 300 mm, f/8.0 | Corner APS-C, 300 mm, f/8.0 | Corner FF, 300 mm, f/8.0 |
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Center, 300 mm, f/11.0 | Corner APS-C, 300 mm, f/11.0 | Corner FF, 300 mm, f/11.0 |
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| Center, 600 mm, f/6.3 | Corner APS-C, 600 mm, f/6.3 | Corner FF, 600 mm, f/6.3 |
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| Center, 600 mm, f/9.0 | Corner APS-C, 600 mm, f/9.0 | Corner FF, 600 mm, f/9.0 |
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Center, 600 mm, f/13.0 | Corner APS-C, 600 mm, f/13.0 | Corner FF, 600 mm, f/13.0 |
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