Samyang 12 mm f/2.0 NCS CS
8. Vignetting
| JPEG | RAW |
| f/2.0 | f/2.0 |
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| 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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Already on JPEG files the vignetting makes itself felt. At the maximum relative aperture it amounts to 44% (-1.69 EV). By f/2.8 it is still clearly visible as its level reaches 32% (-1.13 EV). Only by stopping down the aperture to f/4.0 you can talk about moderate values as the vignetting is 26% (-0.87 EV). Further stopping down has little influence on the image quality in the frame corners because by f/5.6 the level of that aberration gets to 24% (-0.78 EV).
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However, the problem becomes really serious for RAW files. At the maximum relative aperture the vignetting is as high as 54% (-2.21 EV). The stopping down helps but not as much as you would expect. By f/2.8 the brightness loss in the frame corners is 42% (-1.60 EV) and by f/4.0 it still amounts to 35% (-1.27 EV). By f/5.6 and higher aperture values the vignetting remains constant on a level of 32% (-1.12 EV).
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