Carl Zeiss Batis 18 mm f/2.8
8. Vignetting
First, let’s check the vignetting performance on the smaller APS-C sensor; appropriate thumbnails you can find below.
| A7R II, APS-C, f/2.8 | A7R II, APS-C, f/4 |
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Significant physical dimensions of the lens allow it to fare very well in this category. The vignetting is visible only at the maximum relative aperture where it reaches 26% (−0.85 EV). By f/4 and higher apertures it keeps the same level of 17% (−0.52 EV).
After passing to the bigger, full frame sensor there are much more problems and photos below show them clearly.
| A7R II, FF, f/2.8 | A7R II, FF, f/4 |
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| A7R II, FF, f/5.6 | A7R II, FF, f/8 |
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At the maximum relative aperture the brightness loss in the frame corners amounts to 60% (−2.63 EV). Unfortunately, such a value must be called only huge. Still, like in the case of the APS-C sensor, it’s enough you close down the lens by one f-stop and the level of vignetting is reduced to 45.6% (−1.76 EV). Further stopping down is not especially helpful and from f/4 that aberration remains on the same, still distinct level of 42% (−1.57 EV).
