Tamron SP 24-70 mm f/2.8 VC USD G2
7. Coma, astigmatism and bokeh
The Tamron fares here similarly to the Sigma 24-70 mm OS, noticeably better than the Tokina but weaker than the newest models produced by Canon and Nikon.
| Center, 24 mm, f/2.8 | Corner APS-C, 24 mm, f/2.8 | Corner FF, 24 mm, f/2.8 |
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| Center, 45 mm, f/2.8 | Corner APS-C, 45 mm, f/2.8 | Corner FF, 45 mm, f/2.8 |
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| Center, 70 mm, f/2.8 | Corner APS-C, 70 mm, f/2.8 | Corner FF, 70 mm, f/2.8 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 5.4% and it is a value considered by us as medium. It is also, within the margin of error, the same level as in the case of its predecessor.
When it comes to defocused circles of light you can notice differences while comparing the performance of the tested lens to that of the first version of this model. As the characteristic, distinct truncation of the circle in the corner of the sensor remains the same, the structure inside circles changed. In the previous model we saw very noticeable, concentric rings which intensity increased with the stopping down. Aspherical elements were, most likely, responsible for these circles (their main task being also the correction of spherical aberration); the fact that in the new model their intensity is far less pronounced might be interpreted as the possible change of these elements. Also the level of spherical aberration decreased, confirming that hypothesis.
| Center, 70 mm, f/2.8 | Corner APS-C, 70 mm, f/2.8 | Corner FF, 70 mm, f/2.8 |
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| Center, 70 mm, f/4.0 | Corner APS-C, 70 mm, f/4.0 | Corner FF, 70 mm, f/4.0 |
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Center, 70 mm, f/5.6 | Corner APS-C, 70 mm, f/5.6 | Corner FF, 70 mm, f/5.6 |
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