Tamron 17-70 mm f/2.8 Di III-A VC RXD
7. Coma, astigmatism and bokeh
| A7R III, 17 mm, f/2.8, center | A7R III, 17 mm, f/2.8, Corner |
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| A7R III, 30 mm, f/2.8, center | A7R III, 30 mm, f/2.8, Corner |
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| A7R III, 50 mm, f/2.8, center | A7R III, 50 mm, f/2.8, Corner |
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| A7R III, 70 mm, f/2.8, center | A7R III, 70 mm, f/2.8, Corner |
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When it comes to astigmatism, understood as an average difference between horizontal and vertical MTF50 values, it amounted to 6.6%. It's a moderate value, not giving you any reason to worry. Of course you should mention the fact that it is a medium value, averaged out for all focal lengths near the maximum relative aperture. If you start to analize it in depth you can indicate that most of the problems you might encouter at 17-30 mm focal lengths, where this aberration reaches an average level of 11.2%; at longer focal lengths it is negligible, amounting to just 2.1%.
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Out-of-focus images provided by the Tamron 17-10 mm are weak. Circles feature distinct concentric rings (as many as three aspherical elements clearly make themselves felt) and are full of local extreme points. The fact that there are no serious problems with mechanical vignetting, which makes itself felt only at the maximum relative aperture, seems to be the only consolation.
| A7R III, 70 mm, f/2.8, center | A7R III, 70 mm, f/2.8, Corner |
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| A7R III, 70 mm, f/4.0, center | A7R III, 70 mm, f/4.0, Corner |
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| A7R III, 70 mm, f/5.6, center | A7R III, 70 mm, f/5.6, Corner |
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