Tamron SP 15-30 mm f/2.8 Di VC USD
7. Coma, astigmatism and bokeh
| Center, 15 mm, f/2.8 | Corner APS-C, 15 mm, f/2.8 | Corner FF, 15 mm, f/2.8 |
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| Center, 22 mm, f/2.8 | Corner APS-C, 22 mm, f/2.8 | Corner FF, 22 mm, f/2.8 |
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| Center, 30 mm, f/2.8 | Corner APS-C, 30 mm, f/2.8 | Corner FF, 30 mm, f/2.8 |
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The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 5.4%. It is a low results so the correction of that aberration we consider to be good.
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The blurred areas in wide angle lenses are rarely a priority; at the same time you can hardly call them pleasing to the eye. Because of rectilinear deformations, forced by the mapping and visible in the frame corners, the circles of light are lengthened and they tend to converge to the centre; the whole impression is not especially nice. Still it is rather a feature of a lens of such type, not a flaw. Without these deformations there would be no such wide angles of view and the distortion level would have to be a lot higher. You get nothing for nothing and you cannot cheat the laws of physics.
| Center, 30 mm, f/2.8 | Corner APS-C, 30 mm, f/2.8 | Corner FF, 30 mm, f/2.8 |
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| Center, 30 mm, f/4.0 | Corner APS-C, 30 mm, f/4.0 | Corner FF, 30 mm, f/4.0 |
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Center, 30 mm, f/5.6 | Corner APS-C, 30 mm, f/5.6 | Corner FF, 30 mm, f/5.6 |
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