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Lens review

Samyang 21 mm f/1.4 ED AS UMC CS

8 December 2015
Szymon Starczewski

8. Vignetting

Let’s check the vignetting performance of the tested lens both for JPEG and RAW files developed by independent software.

X-E1, JPEG, f/1.4 X-E1, RAW, f/1.4
Samyang 21 mm f/1.4 ED AS UMC CS - Vignetting Samyang 21 mm f/1.4 ED AS UMC CS - Vignetting
X-E1, JPEG, f/2.0 X-E1, RAW, f/2.0
Samyang 21 mm f/1.4 ED AS UMC CS - Vignetting Samyang 21 mm f/1.4 ED AS UMC CS - Vignetting
X-E1, JPEG, f/2.8 X-E1, RAW, f/2.8
Samyang 21 mm f/1.4 ED AS UMC CS - Vignetting Samyang 21 mm f/1.4 ED AS UMC CS - Vignetting


In the case of JPEG files at the maximum relative aperture the vignetting reaches a significantly high level of 45% (−1.73 EV). By f/2.0 it decreases to 29% (−1.00 EV) and by f/2.8 it still is easy to perceive, amounting to 20% (−0.64 EV). Further stopping down is not especially effective as by f/4.0 that aberration reaches a value of 19% (−0.62 EV).

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The results you get for RAW files are just slightly higher. By f/1.4 the brightness loss in the frame corners amounts to 50% (−2.00 EV), by f/2.0 it decreases to 36% (−1.28 EV), and by f/2.8 it drops further to 26% (−0.87 EV). Like in the previous case after that point the stopping down of the aperture doesn’t improve the situation almost at all because by f/4.0 and by f/5.6 the vignetting level amounts to 25% (−0.83 EV).

Samyang 21 mm f/1.4 ED AS UMC CS - Vignetting