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Lens review

Samyang AF 85 mm f/1.4 FE

5 July 2019
Maciej Latao

8. Vignetting

First let's check how the lens performs on the smaller APS-C sensor – appropriate thumbnails can be found below.

A7RII, APS-C, f/1.4 A7RII, APS-C, f/2.0
Samyang AF 85 mm f/1.4 FE - Vignetting Samyang AF 85 mm f/1.4 FE - Vignetting


The light fall-off in the frame corners is noticeable only near the maximum relative aperture where it reaches 30% (−1.03EV). By f/2.0 it disappears practically completely, amounting to 5% and −0.16 EV.

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After passing to the bigger, full frame sensor there are far more problems, as you can notice while looking at photos presented below.

A7RII, FF, f/1.4 A7RII, FF, f/2.0
Samyang AF 85 mm f/1.4 FE - Vignetting Samyang AF 85 mm f/1.4 FE - Vignetting
A7RII, FF, f/2.8 A7RII, FF, f/4.0
Samyang AF 85 mm f/1.4 FE - Vignetting Samyang AF 85 mm f/1.4 FE - Vignetting


The loss of light at the maximum relative aperture is really huge as it amounts to 65% (−3.00 EV). The vignetting is also easy to notice by f/2.0 where it gets to 37% (−1.34EV). Fortunately from f/2.8 onwards the problems end as the brightness loss at that point reaches 18% (−0.57 EV), and by f/4.0 it drops to a level which might be considered imperceptible – 8% (−0.25EV).

Here the Samyang's performance is definitely weaker than that of the Sony GM 1.4/85 which, at the maximum relative aperture, had vignetting of just 54%. Still in the case of the Sony the vignetting decreased slower on stopping down so by f/2.0 both lenses have practically the same results and on further stopping down the Samyang actually performs better.

Sony A7RII, JPEG, f/1.4
Samyang AF 85 mm f/1.4 FE - Vignetting