Carl Zeiss Touit M 50 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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Let’s start our presentation with the JPEG files results. You can spot no problems here – even at the maximum relative aperture the vignetting amounts to just 15% (−0.49 EV) and by f/4.0 it decreases to an imperceptible level of 4% (−0.11 EV).
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The situation on RAW files, developed by an independent program such as dcraw is completely different. By f/2.8 you have to deal with a high level of vignetting which we determined as 48% (−1.86 EV). The aberration still remains distinct by f/4.0 as its value reaches 29% (-0.97 EV). A moderate level is only achievable by f/5.6 where the brightness loss in the frame corners amounts to 20% (-0.63 EV). Further stopping down of the relative aperture only slightly changes the situation. By f/8.0 and f/11.0 the vignetting is, respectively, 14% (−0.43 EV) and 11% (−0.37 EV).
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