Sigma C 45 mm f/2.8 DG DN
8. Vignetting
| A7R II, APS-C, f/2.8 | A7R II, APS-C, f/4.0 |
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In this case you get some chances to notice vignetting practically only at the maximum relative aperture, where it amounts to 26%(−0.87 EV). By f/4.0 it drops to a low level of 15% (−0.46 EV), and by f/5.6 it disappears almost completely, reaching officially just 10% (−0.31 EV).
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Now let's check the situation on full – appropriate thumbnails you can find below.
| A7R II, FF, f/2.8 | A7R II, FF, f/4.0 |
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| A7R II, FF, f/5.6 | A7R II, FF, f/8.0 |
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According to our expectations, there are far more problems. At the maximum relative aperture brightness loss in frame cornes amounts to as much as 62% (−2.76 EV). Also byf/4.0 and f/5.6 you'll be able to notice vignetting without any problems as its level amounts to, respectively, 50% (−2.01 EV) and 44% (−1.69 EV). What's more, that aberration reacts sluggishly to stopping down so by f/8.0 you still deal with a high result of 38% (−1.38 EV). It remains visible also by f/11.0 and f/16.0 apertures, where it reaches, respectively, 32% (−1.11 EV) and 28% (−0.94 EV).
| Sony A7R II, JPEG, f/2.8 |
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