Sony FE 16 mm f/1.8 G
8. Vignetting
| A7R IIIa, APS-C, f/1.8 | A7R IIIa, APS-C, f/2.0 |
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In case of this type of detector you shouldn't complain. At the maximum relative aperture vignetting remains moderate, amounting to 29% (−0.98 EV). By f/2.0 it drops to 22% (−0.71 EV), and by f/2.8 it decreases to a practically imperceptible level of 13% (−0.41 EV).
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What about the full frame detector? Appropriate thumbnails, presented below, show the brightness loss levels and they also concern JPEG files, automatically corrected when it comes to distortion but uncorrected for vignetting.
| A7R IIIa, FF, f/1.8 | A7R IIIa, FF, f/2.0 |
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| A7R IIIa, FF, f/2.8 | A7R IIIa, FF, f/4.0 |
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I admit it: small dimensions of the tested lens and its demanding parameters didn't make me especially optimistic and I expected results exceeding a level of 3 EV. Taking it all into account a result of 60% so -2.63 EV doesn't look very bad. Of course it doesn't change the fact that the vignetting level in this case is very high. Small dimensions of the lens make themselves felt – this aberration cannot be reduced efficiently on stopping down. By f/2.0 you see a level of 55% (-2.31 EV), by f/2.8 we get a still visible value of 45% (-1.72 EV), and by f/4.0 the result is not especially lower, amounting to 41% (-1.54 EV). What's even worse, further stopping down doesn't produce any measureable effects.
In the distortion and field of view chapter we said that we were able to get a field of view approaching almost 113 deg on uncorrected RAW files. Still a question appears how useful this field really is. In this case frame corners can be very dark. Fortunately it is not the case. Vignetting in the corners of this huge field is hardly higher than in corrected JPEG files. In case of the f/1.8 aperture the brightness loss in the corners of RAW files amounted to 61% (-2.70 EV), and by f/2.0 it decreased to 57% (-2.46 EV).
| Sony A7R IIIa, JPEG, f/1.8 |
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