Sony E 11 mm f/1.8
8. Vignetting
Let's check how the tested lens performs in the vignetting category both for JPEG files and for RAW files developped by neutral software. Of course you have to remember that vignetting on JPEGs isn't corrected but distortion is, and, as a result, the files are cropped. Neutral RAWs show, for a change, exactly what optics does with an image- without any distortion and/or vignetting correction.
| A7R III, APS-C, JPEG, f/1.8 | A7R III, APS-C, RAW, f/1.8 |
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| A7R III, APS-C, JPEG, f/2.0 | A7R III, APS-C, RAW, f/2.0 |
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| A7R III, APS-C, JPEG, f/2.8 | A7R III, APS-C, RAW, f/2.8 |
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In case of JPEG files at the maximum relative aperture you have to take into accout the loss of 57% (-2.46 EV) of light in the frame corners. It's a lot but, taking into account the parameters of the tested lens, there are no serious reasons to complain. On stopping down the aperture to f/2.0 vignetting decreases to 53% (-2.18 EV) and by applying f/2.8 you are able to reduce it to a level of 37% (-1.32 EV). Further decrease can be observed by f/4.0 and f/5.6 apertures where we got the following values: 32% (-1.13 EV) and 27% (-0.93 EV). More significant stopping down doesn't produce any measureable effect.
According to our expectations the results on uncorrected RAW files are higher. At the maximum relative aperture you see brightness loss in the frame corners amounting to as much as 62% (-2.79 EV); it decreases to 58% (-2.51 EV) on stopping down the aperture to f/2.0. By f/2.8, f/4.0, and f/5.6 apertures we got, respectively, the following results: 46% (-1.76 EV), 43% (-1.63 EV), and 40% (-1.46 EV).
In case of RAW files further stopping down is still effective: by f/8.0 vignetting is 36% (-1.28 EV), and by f/11.0 it drops to 32% (-1.13 EV).
| Sony A7R III, APS-C, JPEG, f/1.8 |
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