Samyang AF 85 mm f/1.4 FE/RF
8. Vignetting
| A7R II, APS-C, f/1.4 | A7R II, APS-C, f/2.0 |
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The light fall-off in the frame corners is noticeable only near the maximum relative aperture where it reaches 30% (−1.03 EV). 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.
| A7R II, FF, f/1.4 | A7R II, FF, f/2.0 |
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| A7R II, FF, f/2.8 | A7R II, FF, f/4.0 |
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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% (−1.34 EV). 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% (−0.25 EV).
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 A7R II, JPEG, f/1.4 |
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