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Lens review

Samyang 12 mm f/2.0 NCS CS

28 May 2014
Arkadiusz Olech

8. Vignetting

The Fujifilm X system cameras correct the vignetting on JPEG files so we always test the vignetting on both JPEG and RAW files. In the case of the Samyang 2/12 the level of that aberration can be assessed while looking at thumbnails, shown below.

JPEG RAW
f/2.0 f/2.0
Samyang 12 mm f/2.0 NCS CS - Vignetting Samyang 12 mm f/2.0 NCS CS - Vignetting
f/2.8 f/2.8
Samyang 12 mm f/2.0 NCS CS - Vignetting Samyang 12 mm f/2.0 NCS CS - Vignetting
f/4.0 f/4.0
Samyang 12 mm f/2.0 NCS CS - Vignetting Samyang 12 mm f/2.0 NCS CS - Vignetting
f/5.6 f/5.6
Samyang 12 mm f/2.0 NCS CS - Vignetting Samyang 12 mm f/2.0 NCS CS - Vignetting


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).

Samyang 12 mm f/2.0 NCS CS - Vignetting