Sigma C 90 mm f/2.8 DG DN
8. Vignetting
| A7R III, APS-C, JPEG, f/2.8 | A7R III, APS-C, JPEG, f/4.0 |
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At the maximum relative aperture you have to take into account the loss of 25% (-0.83 EV) of light in the frame corners, a moderate value. On stopping down the aperture to f/4.0 it decreases to almost an imperceptible level of 8% (−0.25 EV).
How does it change after passing to a full frame detector? Let's find out! Thumbnails below show clearly that there are more problems.
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| A7R III, FF, JPEG, f/2.8 | A7R III, FF, JPEG, f/4.0 |
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| A7R III, FF, JPEG, f/5.6 | A7R III, FF, JPEG, f/8.0 |
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This time brightness loss at the maximum relative aperture reaches a very high level of 64% (−2.95 EV). It decreases to 42% (−1.60 EV) on stopping down the aperture to f/4.0 and then drops to 35% (−1.22 EV) after applying the f/5.6 aperture. By f/8.0, f/11.0, and f/16.0 we got the following results: 28% (−0.96 EV), 22% (−0.73 EV), and 16% (−0.52 EV) respectively.
In this category the Sigma compares unfavourably with its rivals. For example the Sony FE 90 mm f/2.8 Macro G OSS, a lens distinctly bigger and with the same parameters, had vignetting on a level of 53%.
| Sony A7R III, 90 mm, JPEG, f/2.8 |
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