Carl Zeiss Batis 40 mm f/2 CF
8. Vignetting
| A7R II, APS-C, f/2.0 | A7R II, APS-C, f/2.8 |
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In this case only at the maximum relative aperture you get any chances to notice vignetting as it amounts to 24% (−0.81 EV). By f/2.8 it disappear practically completely, decreasing to 8% (−0.24 EV).
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On passing to the bigger full frame sensor there are far more problems as you can notice while glancing at photos below.
| A7R II, FF, f/2.0 | A7R II, FF, f/2.8 |
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| A7R II, FF, f/4.0 | A7R II, FF, f/5.6 |
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The result we got at the maximum relative aperture is 55% (−2.28 EV). It's a lot but in the case of a lens designed for mirrorless Sony cameras we've seen far weaker results and they concerned even lenses slower aperture-wise than the Batis, tested here. In other words it's not someting you should terribly worry about.
By f/2.8 vignetting decreases to 35% (−1.23 EV), and by f/4.0 to 19% (−0.61 EV). Further stopping down of the aperture influences weakly the aberration, described in this chapter, because by f/5.6 and f/8.0 we got the following values: 18% (−0.58 EV) and 17% (−0.55 EV).
| Sony A7R II, JPEG, f/2.0 |
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