Sony FE 50-150 mm f/2 GM
7. Coma, astigmatism and bokeh
| Center, 50 mm, f/2.0 | Corner APS-C, 50 mm, f/2.0 | Corner FF, 50 mm, f/2.0 |
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| Center, 100 mm, f/2.0 | Corner APS-C, 100 mm, f/2.0 | Corner FF, 100 mm, f/2.0 |
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| Center, 150 mm, f/2.0 | Corner APS-C, 150 mm, f/2.0 | Corner FF, 150 mm, f/2.0 |
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In order to make our test more interesting we decided to show photos of a bright star positioned in the frame corner. This test proved to be even more demanding – far from the centre of the frame point-like images of the star change into slight commas, a classic coma symptom. The effect is not especially pronounced so you shouldn't worry and there are no reasons to criticize the Sony in this area.
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| Corner FF, 50 mm, f/2.0 | Corner FF, 50 mm, f/2.8 | Corner FF, 50 mm, f/4.0 |
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| Corner FF, 150 mm, f/2.0 | Corner FF, 150 mm, f/2.8 | Corner FF, 150 mm, f/4.0 |
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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 8.8%. It is a value positioned on the borderline between a low and medium level so, practically, it doesn't give you any reasons to worry. It's also worth noticing that the highest level of astigmatism we measured at the shortest focal length.
The appearance of out-of-focus images is good for a zoom-type of device. You can't notice any disturbing things but, if you take a closer look you can notice traces of onion ring bokeh stemming from aspherical elements inside the construction. Some reservations can be expressed when it comes to mechanical vignetting as it doesn't disappear completely even on stopping down the aperture by 2 EV.
| Center, 150 mm, f/2.0 | Corner APS-C, 150 mm, f/2.0 | Corner FF, 150 mm, f/2.0 |
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| Center, 150 mm, f/2.8 | Corner APS-C, 150 mm, f/2.8 | Corner FF, 150 mm, f/2.8 |
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Center, 150 mm, f/4.0 | Corner APS-C, 150 mm, f/4.0 | Corner FF, 150 mm, f/4.0 |
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