Carl Zeiss Touit 12 mm f/2.8
8. Vignetting
| 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 JPEG files there are almost no reasons to complain. At the maximum relative aperture the vignetting gets to 26% (-0.88 EV) and is moderate. The problems disappear on stopping down. By f/4.0 the brightness loss in frame corners amounts to just 15% (-0.47 EV) and by f/5.6 it decreases further to 12% (-0.36 EV).
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In RAW files the situation is much more serious. At the maximum aperture the vignetting is high, reaching 48% (-1.91 EV). On stopping down to f/4.0 that aberration decreases to 37% (-1.35 EV). Further stopping down influences it very weakly – by f/5.6 it is 33% (-1.16 EV) and by f/8.0 it remains 31% (-1.07 EV). Applying f/11 and f/16 doesn’t change the vignetting level in any measurable way.
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