Fujifilm Fujinon XF 27 mm f/2.8
8. Vignetting
A comparison of the light fall-off in the corners of the frame by different aperture values and for both types of files is presented in thumbnails below.
| JPEG | RAW |
| f/2.8 | f/2.8 |
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| f/4.0 | f/4.0 |
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| f/5.6 | f/5.6 |
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In the case of JPEG files at the maximum relative aperture you must take into account the loss of 23% of light (-0.74 EV) in the frame corners. It is a moderate value which decreases to low by f/4.0, reaching 18% (-0.59 EV). By f/5.6 and f/8.0 it is already almost imperceptible, amounting to 13% (-0.40 EV) and 10% (-0.30 EV) respectively.
Still the real level of vignetting can be observed only when you analyze RAW files. Here, at the maximum relative aperture, the brightness loss in the frame corners gets to a very high level of 46% (-1.81 EV). On stopping down to f/4.0 that aberration decreases significantly to 30% (-1.05 EV). By f/5.6 the vignetting still reaches 22% (-0.74 EV) and by f/8.0 it is 18% (-0.57 EV). Further stopping down doesn’t change the vignetting value.
To sum up the lens didn’t exactly distinguished itself in this category; still the same remark will be true for any “pancake” vignetting test so such a conclusion is hardly surprising.
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