LensTip.com

Lens review

Carl Zeiss Touit 12 mm f/2.8

30 August 2013
Arkadiusz Olech

8. Vignetting

The vignetting, like the distortion, is corrected automatically in JPEG files. In order to get to know its real nature you have to measure it also, or even above all, in RAW files. The thumbnails, presented below, make comparing the vignetting levels by different aperture values for both types of files easier.

JPEG RAW
f/2.8 f/2.8
Carl Zeiss Touit 12 mm f/2.8 - Vignetting Carl Zeiss Touit 12 mm f/2.8 - Vignetting
f/4.0 f/4.0
Carl Zeiss Touit 12 mm f/2.8 - Vignetting Carl Zeiss Touit 12 mm f/2.8 - Vignetting
f/5.6 f/5.6
Carl Zeiss Touit 12 mm f/2.8 - Vignetting Carl Zeiss Touit 12 mm f/2.8 - Vignetting


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.

Carl Zeiss Touit 12 mm f/2.8 - Vignetting